JP4329401B2 - Recording apparatus and recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium including a plurality of information recording layers. To the body The present invention relates to a corresponding recording apparatus and recording method.
[0002]
[Prior art]
[Patent Document 1]
JP-A-11-167725
As an optical recording medium capable of optically recording or reproducing information, an optical disk, an optical card, and the like are known. Information recording or reproduction is performed on these optical recording media by using a laser beam such as a semiconductor laser as a light source and irradiating a minutely condensed light beam through a lens.
[0003]
In these optical recording media, technical development for further increasing the recording capacity has been actively conducted. The conventional information recording of an optical disc has been focused on increasing the recording density on the recording surface of the disc. For example, attempts have been made to reduce the track pitch or increase the recording density in the linear velocity direction in recording and reading scanning in combination with shortening of the wavelength of the light source that emits the recording beam and signal processing of the reproduction system.
[0004]
However, even if the wavelength of the light source is shortened, the recording density can be improved due to the limitation to the ultraviolet region and the fact that the pit size can only be reduced to a size that can be transferred to a disk at the time of cutting. Attempts to do so will eventually be limited in the two-dimensional area of the disc.
Therefore, a method for increasing the capacity is also considered three-dimensionally. That is, a multilayer disc formed by laminating information recording layers is attracting attention in order to increase the density of recorded information in the thickness direction of the disc.
[0005]
A multilayer recording medium in which recording layers are stacked has a feature that the recording capacity can be doubled according to the number of recording layers and can be easily combined with other high-density recording techniques. As a multilayer recording medium, for example, a DVD (Digital Versatile Disc) -ROM which is a read-only optical disk has already been put into practical use.
For example, Patent Document 1 discloses a technique that can be applied to a case where a DVD-ROM or the like has two recording layers.
In the future, not only ROM type discs but also practical use of recordable multilayer recording media in which recordable recording layers such as phase change materials, magneto-optical materials, and dye materials are laminated is expected. For example, in the case of a DVD-type disc, the realization of a multi-layer recording layer is assumed even in a write-once type disc called DVD-R, DVD + R, or a rewritable type disc called DVD-RW, DVD + RW, or the like.
[0006]
[Problems to be solved by the invention]
However, in the case of a recordable type multilayer recording medium, the following problems are assumed.
[0007]
For a disc on which data has been recorded by a recording device, it is required that the data can be read by a reproduction-only device. That is compatibility.
Since the read-only device reads the pits recorded on the disk surface, the servo is not applied in the area without pits, and the data cannot be read stably. Therefore, a guard area is required. Similarly, an area called lead-in / lead-out is also necessary.
For this reason, in the recording apparatus, after recording user data on a disc, lead-in / lead-out recording is performed, and an area where user data is not recorded (remaining area) is, for example, dummy data (read Out). That is, the reproduction-only device is prevented from reaching an area without pits when reading data. For example, such a process is performed in a process called disc close (or finalize) in DVD-R, DVD + R, or the like.
However, such a process of recording dummy data and filling the entire surface with pits so that an unrecorded area does not occur on the disk board surface is a major factor in lengthening the entire recording operation.
In particular, in the case of a disc having a large capacity by a plurality of recording layers, when a close process is performed without further recording, the remaining area tends to increase, and the time required for recording dummy data tends to increase. is there.
[0008]
Further, in an optical disc having a multilayer structure, a recording layer farther from the optical pickup is required to adjust the recording laser power with higher accuracy.
That is, in a multilayered optical disk, the recording layers may overlap, and the transmittance closer to the optical pickup (closer to the laser incident surface) is set higher. Therefore, when information is recorded on a recording layer far from the optical pickup, the laser power at the time of recording must be adjusted with higher accuracy so that a correct recording mark can be formed.
If optimal recording power control (OPC: Optimum Power Control) of the recording laser is not performed accurately, jitter will increase when information recorded on the optical disk is recorded after information recording, and accurate information reproduction will be performed. There is a possibility that will not be done.
[0009]
Also, in the case of a recording medium such as an optical disk, when an optical disk is manufactured by laminating an optical disk substrate, deformation such as warpage is likely to occur on the outer periphery, recording film formation unevenness (non-uniformity), etc. When the information recorded on the optical disk is reproduced after performing the above, the jitter becomes large, and there is a possibility that accurate information is not reproduced. In particular, these influences are large on the disk outer periphery side.
If the optical disk is not protected by a cartridge or the like, the outer periphery of the disk is often damaged depending on how the user handles it.
This is not a problem limited to multi-layer discs, but some countermeasures are required for multi-layer discs.
[0010]
[Means for Solving the Problems]
In consideration of these circumstances, the present invention effectively utilizes the fact that the recordable type recording medium having a multi-layered recording layer shortens the recording time and has a large capacity due to the multi-layer structure. Therefore, an object is to realize a highly reliable recording operation.
[0011]
The recording apparatus of the present invention has a plurality of recording layers into which data can be written, and by data writing, includes a data area including main data, a preceding area that is positioned preceding the data area, and a succeeding data area. With termination area to The lead-out area or middle area added at the end of the data area or in the middle It is formed DVD system In a recording apparatus for a disc-shaped recording medium, a recording means for recording data on each recording layer, a data amount detecting means for detecting the total amount of data to be recorded on the recording medium, and a detection by the data amount detecting means Based on the total amount of data that has been written, an area range for data writing is set for each of the recording layers so that the recording amount of the termination area formed for reproduction compatibility is minimized, and data writing is performed. Control means for controlling the operation, the control means, for each recording layer, when the main data is recorded to a position of less than 68 mm in diameter, a lead-out area or a middle area that replaces the lead-out area The first condition of forming at least a position with a diameter of 70 mm, and the main data is between a diameter of 68 mm and a diameter of 115 mm In the case of recording up to the position, the second condition that the lead-out area or the middle area is formed in a range of 2 mm in the radial direction from the recording end of the main data, and the main data is from a diameter of 115 mm. When recording is performed up to a position between diameters of 116 mm, the third condition of forming the lead-out area or the middle area in the range from the recording end of the main data to at least a diameter of 117 mm is satisfied. As described above, an area range in which data is written in each recording layer is set, and control for adjusting the recording laser power in each recording layer is performed, and the total data amount detected by the data amount detecting unit, Based on the result of the recording laser power adjustment, an area range in which data is written for each recording layer is used. To set.
Alternatively, the control unit monitors the address reading state from the recording medium during the recording operation, and based on the total data amount detected by the data amount detecting unit and the monitoring state of the address reading state, An area range in which data is written is set for each recording layer.
Alternatively, the control means targets each recording layer based on the total data amount detected by the data amount detection means and the pre-recorded media information of the recording medium read from the recording medium. As described above, an area range for writing data is set.
[0012]
The recording method of the present invention has a plurality of recording layers to which data can be written, and by data writing, a data area including main data, a preceding area that is positioned preceding the data area, and a succeeding data area As a recording method for a DVD-type disc-shaped recording medium in which a lead-out area added to the end or middle of the data area or a middle area is formed as a termination area, the total amount of data to be recorded on the recording medium is Based on the detected total data amount, an area range for data writing is set for each recording layer so that the recording amount of the termination area formed for reproduction compatibility is minimized. Data writing, and the total data amount detected and the recording laser power adjustment in each recording layer. Based on the results of the Set the area range for writing data for each recording layer. If the main data is recorded to a position less than 68 mm in diameter, the area range is defined as a first condition that a lead-out area or a middle area that replaces the lead-out area is formed to a position having a diameter of at least 70 mm. When the main data is recorded at a position between 68 mm and 115 mm in diameter, the lead-out area or the middle area is formed in a range of 2 mm in the radial direction from the recording end of the main data. 2 and when the main data is recorded at a position between a diameter of 115 mm and a diameter of 116 mm, the lead-out area or the middle area is within a range from the recording end of the main data to at least a diameter of 117 mm. Each of the above recordings so as to satisfy any one of the third conditions of forming To set in.
Alternatively, the setting of the area range in which the data is written is performed based on the total amount of data detected and the monitoring status of the address reading state from the recording medium during the recording operation.
Alternatively, the setting of the area range in which the data is written is performed based on the detected total data amount and the prerecorded media information of the recording medium read from the recording medium.
[0014]
That is, according to the present invention, an appropriate data writing operation is realized by setting an area range in which data is written for each recording layer based on the total amount of data to be recorded on the recording medium having a multilayer structure.
For example, if the recording amount of the end area formed for reproduction compatibility is minimized, the time required for recording the end area can be shortened.
In the case of a multilayer recording medium with a large capacity, when there is no need (that is, when recording without using a full capacity), there is a high possibility that accurate information reproduction is performed when reproducing as much as possible. It is better to record from the place. In other words, it is not necessary to forcibly record at a position that is disadvantageous for reproduction. From such a viewpoint, an effective recording process can be considered.
That is, for example, if an area range in which data is written is set based on the detected total data amount and the result of recording laser power adjustment in each recording layer, for example, a recording layer in which recording laser power adjustment is difficult can be avoided. Such a recording can be executed.
In addition, setting the area range for writing data based on the total amount of data detected and the monitoring status of the address read state from the recording medium during the recording operation can be performed during the recording. When there is a recording layer that cannot be recorded, recording can be performed so as to avoid continuation of recording in the recording layer.
In addition, if the area range in which data is written is set based on the total amount of data detected and the additional information read from the recording medium, the recording layer can be used flexibly according to the individual circumstances of the recording medium. Recording is possible.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in the following order.
1. disk
1-1 Area structure of the recording layer
1-2 Double-layer disc
1-3 Recording operation method
2. Disk drive device
2-1 Device configuration
2-2 Judgment processing of user data recording amount
2-3 Recording area range setting based on recording data volume
2-4 Recording area range setting by recording data amount and OPC result
2-5 Recording area range setting by recording data amount and address reading status
2-6 Recording area range setting with recording data amount and additional information
3. Modified example
[0016]
1. disk
1-1 Area structure of the recording layer
In the present embodiment, a DVD (Digital Versatile Disc) is taken as an example of a large-capacity disk recording medium, and a disk drive apparatus described later is an apparatus that performs recording and reproduction on a disk as a DVD.
[0017]
There are a plurality of standards such as DVD + R, DVD-R, DVD-RW, DVD-RW, DVD-RAM, etc. as recordable types in DVD-type discs. Here, DVD + R, which is a write-once medium, will be described as an example.
[0018]
For example, when a disc as a DVD + R is loaded into a disc drive device (recording device), information unique to the disc is read from ADIP (Address in pre-groove) information carved in a wobbling groove on the recording surface. , A DVD + R disc is recognized. The recognized disc is recorded, eventually ejected from the recording device, and loaded again into the recording device. At this time, it may be loaded again into the same recording device, or it may be loaded into another recording device or reproducing device for data exchange.
In consideration of such usage, the logical format of DVD is formulated to facilitate recording compatibility and playback compatibility between devices.
[0019]
First, FIG. 1 shows a layout of a recording layer of DVD + R.
As shown in the figure, as a logical data layout in the recording layer of DVD + R, an information zone is formed from the inner circumference side of the disc to the outer circumference side. This information zone is an area that contains all the information necessary to ensure data recording compatibility and playback compatibility.
The information zone includes one or more sessions.
[0020]
The information zone mainly consists of the following five areas.
▲ 1 ▼ Inner drive area
(2) Lead-in zone (also called lead-in area)
(3) Data zone (also called data area)
(4) Lead-out zone (also called lead-out area)
(5) Outer drive area
[0021]
Here, the lead-in zone, the data zone, and the lead-out zone are in an area that can be accessed without trouble even by a reproduction-only device.
The inner drive area and the outer drive area are areas dedicated to the recording apparatus. When recording information, the laser power at the time of recording must be adjusted so that correct recording marks can be formed. For this reason, test zones that can be used for test recording for obtaining optimum recording conditions and areas where management information relating to the recording conditions can be recorded are formed in the inner drive area and the outer drive. Since the recording state of the test zone becomes non-uniform due to the test recording, there is no guarantee that the reproduction-only device can be accessed without any trouble.
[0022]
A physical sector number (PSN: physical sector number) is given as absolute position information on the disk.
As shown in the figure, for example, the value of the physical sector number is increased from the inner circumference side to the outer circumference side of the disk. In the case of DVD + R, PSN = 2FFFFh (the numerical value with h is expressed in hexadecimal) is the end of the lead-in zone, PSN = 30000h Starts the data zone.
The data zone is basically an area where user data is written, and the lead-in zone is where management information is written. In the lead-out zone, for example, dummy data is written for the purpose of maintaining compatibility with a read-only disk, but management information may also be written.
[0023]
When compatibility with a read-only disc is desired, it is necessary to complete recording with a session configuration including a lead-in zone, a data zone in which an unrecorded portion does not remain, and a lead-out zone.
In the case of write-once media, as already known, after user data is written to the data zone, appropriate management information is recorded in the lead-in zone when the session (or the entire disc) is closed. In addition, the area in which no user data has been written in the data zone is filled with dummy data (lead-out), so that the media can be played back by other playback devices. In other words, in the unclosed state (open state), appropriate management information has not yet been written in the lead-in zone, and there is no reproduction compatibility at that time. In addition, if there is an unrecorded area in which no pits are formed in the data area, dummy data is written because appropriate tracing cannot be performed in the reproducing apparatus.
In other words, reproduction compatibility can be obtained by completing the writing of necessary user data and performing the closing process when no new writing is performed. In that case, new writing cannot be performed. On the other hand, the open state is a state in which new data can be written yet, although reproduction compatibility is not obtained.
The completion of recording with the session configuration including the lead-in zone, the data zone in which no unrecorded portion remains, and the lead-out zone means that a close process is performed.
[0024]
By the way, as a DVD disc, it is necessary to satisfy any one of the following conditions 1 to 3 for the lead-out area and middle area added at the end of user data or in the middle of the standard. The middle area is an area provided in each layer in a dual-layer disc described later, and is an area having a function similar to a lead-out in each layer.
[0025]
Condition 1: The user data area recorded on the disc is diameter If it is less than 68 mm, the lead-out area or middle area is diameter Records up to 70mm.
Condition 2: The user data area recorded on the disc is diameter From 68mm diameter If the length is 115mm, the lead-out area or middle area is 2mm from the end of the user data. diameter Recorded in the interval.
Condition 3: User data recorded on the disc is diameter From 115mm diameter If the position is up to 116mm, the lead-out area or middle area diameter Records up to 117mm.
[0026]
1-2 Double-layer disc
Here, in the recordable DVD, when considering a two-layer DVD having two recording layers, a structure in which two recording layers as a dye change recording film or a phase change recording film are laminated at a relatively small interval is formed. It will have.
FIG. 2 schematically shows a state in which layer 0 and layer 1 are stacked as two recording layers in the disc 1.
At the time of recording such a two-layer disc, laser light emitted from the optical pickup 3 of the disc drive device through the objective lens 3a is narrowed down to any recording layer, and a signal is recorded on the recording layer.
When viewed from the objective lens 3 side, the layer 0 is the closer recording layer, and the layer 1 is the far recording layer.
[0027]
In the case of a dual-layer disc, two recording methods, a parallel track path and an opposite track path, can be considered.
FIG. 3 shows a parallel track path.
As described above, the physical sector number PSN (Physical Sector Number) is a real address recorded on the disk surface. On the other hand, a logical block address LBA (Logical Block Number) is an address assigned to a logical data sequence handled by a computer. The PSN and LBA are in one-to-one correspondence.
[0028]
In the case of the parallel track path shown in FIG. 3A, a lead-in area, a data area, and a lead-out area are formed from the inner circumference side to the outer circumference side for both layers 0 and 1.
Data recording starts from Start PSN (= 30000h) on the inner periphery of layer 0 to End PSN (0), which is the last of the data area of layer 0. Subsequently, recording is performed in the recording order from Start PSN (= 30000h) on the inner circumference side of Layer 1 to End PSN (1) on the outer circumference side.
As shown in FIG. 3B, the logical block address LBA is sequentially allocated in order from the inner periphery side to the outer periphery side of layer 0 and further from the inner periphery side to the outer periphery side of layer 1.
[0029]
The opposite track path is shown in FIG. In a disc having an opposite track path, the recording order starts from the inner periphery of layer 0 to the end of layer 0 and then moves from the outer periphery of layer 1 to the inner periphery.
As shown in FIG. 4A, in the case of an opposite track path, in layer 0, a lead-in area, a data area, and a middle area are formed from the inner circumference side to the outer circumference side. In layer 1, a middle area, a data area, and a lead-out area are formed from the outer peripheral side to the inner peripheral side.
Data recording starts from Start PSN (= 30000h) on the inner periphery of layer 0 to End PSN (0), which is the last of the data area of layer 0. The continuation is The recording order is from the outer peripheral side (reverse End PSN (0)) of the data area of Layer 1 to the End PSN (1) on the inner peripheral side.
As shown in FIG. 4B, the logical block address LBA is assigned continuously from the inner periphery side to the outer periphery side of the layer 0, and then in the direction from the outer periphery side to the inner periphery side so as to return in the layer 1. , Allocated sequentially in sequence.
[0030]
Thus, there is a difference in the physical storage method (order) of data between the parallel track path and the opposite track path.
Further, in the case of an opposite track path, a middle area is added to the outer periphery from the interlayer folded portion. This is due to the following reason. In the case of an opposite track path, a lead-in area is formed in layer 0 and a lead-out area is formed in layer 1. For this reason, no lead-in area / lead-out area is formed on the outer peripheral side of the data area. On the other hand, since the read-only device reads the pit recorded on the disk surface, the servo is not applied in the area without the pit and the data cannot be read stably. Therefore, a guard area is required. Due to this necessity, a middle area is formed on the outer peripheral side, for example, dummy data is recorded, and the same function as the lead-out area is provided.
[0031]
1-3 Recording operation method
In the present embodiment, as described above, as the recording operation for the two-layer disc, an interlayer transition position (a point for transition from layer 0 to layer 1) is set as described below, and recording is performed on layers 0 and 1 By setting the area range to be performed, the recording time can be shortened and highly reliable recording can be realized.
[0032]
3 and 4 show a state in which user data is recorded to the full capacity of the disk, but actually, the user data is not necessarily recorded using the full capacity. In actual use, close processing is often performed even if there is still a recordable area on the disc.
[0033]
As described above, the remaining area (area where pits are not formed) will interfere with reproduction compatibility as it is, so that a lead-out with all-zero dummy data is formed.
5A and 6A show normal recording operations in the case of an opposite track path and a parallel track path, respectively.
5 and 6, “UA” is an area without pits (Unrecorded Area), “DA1” to “DA12” are recorded user data, “LI0” is a layer 0 lead-in, and “LI1” is a layer 1, “LO0” indicates a layer 0 lead-out, “LO1” indicates a layer 1 lead-out, “MA0” indicates a layer 0 middle area, and “MA1” indicates a layer 1 middle area.
[0034]
FIG. 5A shows a state in which user data DA1 to DA12 are recorded and then closed on the opposite track path disc.
In this case, for example, user data DA1 to DA10 are recorded in layer 0, and user data DA11 to DA12 are recorded in layer 1.
In layer 0, the lead-in LI0 is formed at a position preceding the user data DA1 to DA10, and the middle area MA0 is formed at a position following the user data DA1 to DA10.
In the layer 1, the middle area MA1 is formed on the outer peripheral side from the user data DA11 to DA12, and the lead-out LO1 is formed on the inner peripheral side from the user data DA11 to DA12.
In this case, the lead-out LO1 (dummy data) is recorded for a long period as shown in the figure in order to eliminate the area where no pit exists as described above.
[0035]
FIG. 6A shows a state in which the user data DA1 to DA12 are recorded and then closed on the parallel track path disc.
Also in this case, for example, user data DA1 to DA10 are recorded in layer 0, and user data DA11 to DA12 are recorded in layer 1.
In layer 0, lead-in LI0 is formed at a position preceding user data DA1-DA10, and lead-out LO0 is formed at a position following user data DA1-DA10.
In layer 1, a lead-in LI1 is formed at a position preceding the user data DA11 to DA12, and a lead-out LO1 is formed at a position following the user data DA11 to DA12.
In this case as well, the lead-out LO1 (dummy data) is recorded for a long period as shown in FIG.
[0036]
When the user data to be recorded does not require the entire two-layer recordable area, dummy data recording in a long section on the disc is required.
That is, in recording using a two-layer disc, even if all necessary user data is recorded, if there is a surplus area, it takes a long time to record dummy data. In other words, if the amount of user data to be recorded is small, the time required for the recording operation (user data recording and closing process) can be shortened accordingly, but the time cannot be shortened due to the necessity of dummy data recording.
However, moreover, if the dummy data recording area can be minimized, the time can be reduced.
[0037]
If user data can be recorded in one layer (only layer 0), there is no problem as long as it can be used as a single-layer disc with the end as a lead-out. For example, all layers 1 need to be recorded as dummy data. If so, the recording time is similarly prolonged.
[0038]
In the present embodiment, a recording method that can minimize the recording of dummy data (leadout) is executed.
FIG. 5B shows a recording operation in this example for a disc with an opposite track path.
As in FIG. 5A, the user data DA1 to DA12 are recorded. In this case, user data DA1 to DA6 are recorded on layer 0, and user data DA7 to DA12 are recorded on layer 1.
In layer 0, the lead-in LI0 is formed at a position preceding the user data DA1 to DA6, and the middle area MA0 is formed at a position following the user data DA1 to DA6.
In layer 1, a middle area MA1 is formed on the outer peripheral side from the user data DA7 to DA12, and a lead-out LO1 is formed on the inner peripheral side from the user data DA11 to DA12.
As can be seen from the figure, the lead-out LO1 formed as a record of dummy data is minimized because the recording of the user data DA1 to DA12 is transferred from the layer 0 to the layer 1 with half the data amount. It becomes the area of.
[0039]
FIG. 6B shows the recording operation in this example for a disk with a parallel track path.
As in FIG. 6A, the user data DA1 to DA12 are recorded. In this case, user data DA1 to DA6 are recorded on layer 0, and user data DA7 to DA12 are recorded on layer 1.
In layer 0, lead-in LI0 is formed at a position preceding user data DA1-DA6, and lead-out LO0 is formed at a position following user data DA1-DA6.
In layer 1, a lead-in LI1 is formed at a position preceding the user data DA7 to DA12, and a lead-out LO1 is formed at a position following the user data DA7 to DA12.
As can be seen from the figure, the lead-out LO1 formed as a record of dummy data is minimized because the recording of the user data DA1 to DA12 is transferred from the layer 0 to the layer 1 with half the data amount. It becomes the area of.
[0040]
That is, on the condition that the amount of user data to be recorded is known in advance, the area range in which data is written for each recording layer is set so that half of the user data is recorded on each recording layer. Specifically, the address in layer 0 as the interlayer transition position for transition from layer 0 to layer 1 is set to the point where the recording of about half of the user data is completed. Then, based on the setting, the user data is divided and recorded on each recording layer in approximately half, so that the area where the lead-out must be formed can be minimized.
As a result, the recording time (close processing time) can be shortened.
Of course, even when the amount of user data is the amount that can be recorded only by layer 0, it is effective for minimizing the lead-out area (dummy data recording area) by allocating the data to layer 0 and layer 1 in half. is there.
[0041]
In the DVD type disc such as DVD + R, the range for forming the middle areas MA0 and MA1 in the case of FIG. 5B or the range for forming the lead-outs LO0 and LO1 in the case of FIG. Any one of the conditions 1 to 3 may be satisfied.
[0042]
The examples in FIGS. 5 and 6 have been described mainly for the purpose of shortening the recording time (minimizing the lead-out area). However, when the amount of user data to be recorded is known in advance. Depending on other conditions, highly reliable recording is realized by setting an area range in which data is written for each recording layer. The other conditions mentioned here include, for example, an OPC (laser power adjustment) result, additional disk information, an address reading situation during recording, and the like. The setting of the area range using these, that is, how to use layer 0 and layer 1 for recording will be described later as the processing of the disk drive device, but it is possible to perform suitable recording from the viewpoint of improving the reliability of each. Become.
[0043]
For example, in layers 0 and 1, layer 1 requires more precise adjustment of the recording laser power, and in some cases, adjustment to the optimum recording laser power may not be possible. In this case, it is preferable to use only layer 0 if the amount of user data is within one layer.
Further, if a disc whose outer peripheral side is unstable due to disc warp or the like can be discriminated from the additional information, in that case, recording without using the outer peripheral side is appropriate.
Furthermore, if the address reading deteriorates during recording, the recording layer becomes unstable. Therefore, if the other layer is used accordingly, highly reliable recording can be realized.
[0044]
In this example, the disk drive device determines the layer transition position, more specifically, the end point of the layer 0 user data, based on the amount of user data and the above conditions.
In a recordable type disc, the end point is determined by the amount of user data to be recorded, and information indicating the end point (the address of End PSN (0) in FIGS. 3 and 4) is managed in the lead-in. Recorded as information. For this reason, the interlayer transition position (end point of the recording layer) can be arbitrarily set by the disk drive device (it is not fixed according to the standard).
[0045]
2. Disk drive device
2-1 Device configuration

A disk drive apparatus according to the present embodiment corresponding to the above-described two-layer disk (such as a two-layer DVD + R) will be described with reference to FIG.
FIG. 7 is a block diagram of the main part of the disk drive device of this example.
The disk 1 is loaded on a turntable (not shown) and is rotationally driven by a spindle motor 2 at a constant linear velocity (CLV) or a constant angular velocity (CAV) during a recording / reproducing operation. And the embossed pit form on the disc 1 by the pickup 3, Pigment change pit form Alternatively, data recorded in the form of phase change pits is read out.
[0046]
In the pickup 3, a laser diode serving as a laser light source, a photodetector for detecting reflected light, an objective lens serving as an output end of the laser light, and a laser recording light are irradiated onto the disk recording surface via the objective lens. An optical system that guides the reflected light to the photodetector, a biaxial mechanism that holds the objective lens movably in the tracking direction and the focus direction, and the like are formed.
Further, the entire pickup 3 can be moved in the radial direction of the disk by the slide drive unit 4.
[0047]
Reflected light information from the disk 1 is detected by a photo detector, converted into an electric signal corresponding to the amount of received light, and supplied to the RF amplifier 8.
The RF amplifier 8 includes a current-voltage conversion circuit, a matrix calculation / amplification circuit, and the like corresponding to output currents from a plurality of photodetectors in the pickup 3, and generates necessary signals by matrix calculation processing. For example, an RF signal as reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like are generated.
The reproduction RF signal output from the RF amplifier 8 is supplied to the reproduction signal processing unit 9, and the focus error signal FE and the tracking error signal TE are supplied to the servo control unit 10.
[0048]
The reproduction RF signal obtained by the RF amplifier 8 is subjected to binarization, PLL clock generation, decoding processing for the EFM + signal (8-16 modulation signal), error correction processing, and the like in the reproduction signal processing unit 9.
The reproduction signal processing unit 9 performs decoding processing and error correction processing using the DRAM 11. The DRAM 11 is also used as a cache for storing data obtained from the host interface 13 and transferring data to the host computer.
Then, the signal processing unit 9 accumulates the decoded data in the DRAM 11 as a cache memory.
As the reproduction output from the disk drive device, the data buffered in the DRAM 11 is read and transferred and output.
[0049]
In the signal processing unit 9, sub-code information, address information (ATIP information, LPP information, ADIP information, sector ID information, etc.), and management information are selected from information obtained by EFM + demodulation and error correction for the RF signal. And additional information are extracted, and these pieces of information are supplied to the controller 12.
The controller 12 is formed by a microcomputer, for example, and controls the entire apparatus.
[0050]
The host interface 13 is connected to a host device such as an external personal computer, and communicates reproduction data and read / write commands with the host device.
That is, the reproduction data stored in the DRAM 11 is transferred and output to the host device via the host interface 13.
Also, read / write commands, recording data, and other signals from the host device are buffered in the DRAM 11 or supplied to the controller 12 via the host interface 13.
[0051]
Recording to the disk 1 is performed by supplying a write command and recording data from the host device.
At the time of data recording, the recording data buffered in the DRAM 11 is subjected to processing for recording in the modulation unit 14. That is, processing such as error correction code addition and EFM + modulation is performed.
The recording data modulated in this way is supplied to the laser modulation circuit 15. The laser modulation circuit 15 drives the semiconductor laser in the pickup 3 according to the recording data, executes laser output according to the recording data, and writes data to the disk 1.
[0052]
During this recording operation, the controller 12 is controlled to irradiate the recording area of the disk 1 with laser light from the pickup 3 with recording power. When the disk 1 is of a write-once type using a dye change film as a recording layer, pits due to dye change are formed by laser irradiation of recording power.
In the rewritable disk in which the disk 1 is a phase change recording layer, the crystal structure of the recording layer is changed by the heating of the laser beam, and phase change pits are formed. That is, various data are recorded by changing the presence and length of pits. Further, when the portion where the pits are formed is irradiated again with laser light, the crystal state changed at the time of data recording is restored to the original state by heating, the pits disappear and the data is erased.
[0053]
The servo control unit 10 receives various focus, tracking, thread, and spindle servo drives from the focus error signal FE and tracking error signal TE from the RF amplifier 8 and the spindle error signal SPE from the reproduction signal processing unit 9 or the controller 12. Generate a signal and execute servo operation.
That is, a focus drive signal and a tracking drive signal are generated according to the focus error signal FE and the tracking error signal TE, and supplied to the focus / tracking drive circuit 6. The focus / tracking drive circuit 6 drives the focus coil and tracking coil of the biaxial mechanism in the pickup 3. As a result, the pickup 3, the RF amplifier 8, the servo control unit 10, the focus / tracking drive circuit 6, the tracking servo loop and the focus servo loop by the biaxial mechanism are formed.
[0054]
When the focus servo is turned on, a focus search operation must first be executed. The focus search operation is to detect a position where the S-shaped curve of the focus error signal FE is obtained while forcibly moving the objective lens in a state where the focus servo is off. As is well known, the linear region of the S-curve of the focus error signal is a range in which the position of the objective lens can be drawn to the in-focus position by closing the focus servo loop. Therefore, the focus search operation detects the above pullable range while forcibly moving the objective lens and turns on the focus servo at that timing, so that the laser spot is kept in focus thereafter. Servo operation is realized.
[0055]
In the case of this example, the disc 1 may have a two-layer structure as layer 0 and layer 1 as described above.
Of course, when recording / reproduction is performed on layer 0, the laser beam must be in focus on layer 0. When recording / reproducing is performed on layer 1, the laser beam must be in focus on layer 1.
Such movement of the focus position between layers 0 and 1 is performed by a focus jump operation.
When the focus jump operation is in focus in one layer, the focus servo is turned off and the objective lens is forcibly moved to reach the focus pull-in range for the other layer (S-curve is observed). This is executed by turning on the focus servo at the time.
[0056]
The servo control unit 10 further supplies a spindle drive signal generated according to the spindle error signal SPE to the spindle motor drive circuit 7. The spindle motor drive circuit 7 applies, for example, a three-phase drive signal to the spindle motor 2 in accordance with the spindle drive signal, and causes the spindle motor 2 to rotate. The servo control unit 10 also generates a spindle drive signal in response to a spindle kick / brake control signal from the controller 12, and causes the spindle motor drive circuit 7 to perform operations such as starting, stopping, accelerating and decelerating the spindle motor 2.
[0057]
The servo control unit 10 generates a slide drive signal based on, for example, a slide error signal obtained as a low frequency component of the tracking error signal TE, an access execution control from the controller 12, and supplies the slide drive signal to the slide drive circuit 5. The slide drive circuit 5 drives the slide drive unit 4 according to the slide drive signal. Although not shown in the figure, the slide drive unit 4 has a mechanism including a main shaft that holds the pickup 3, a thread motor, a transmission gear, and the like, and the slide drive circuit 5 drives the slide drive unit 4 in response to a slide drive signal. The required slide movement of the pickup 3 is performed.
[0058]
As described above, the laser modulation circuit 15 is driven so that laser light corresponding to the recording data is output from the laser diode in the pickup 3 at the time of recording. At the time of recording, the laser modulation circuit 15 is modulated by the recording laser at a high level laser power. The laser output is executed, and at the time of reproduction, continuous laser output is executed with a low level laser power.
For this reason, the laser modulation circuit 15 has a write strategy circuit that performs laser modulation signal and waveform shaping according to recording data, a laser drive circuit that drives the laser diode, and a power control circuit that controls the laser power constant. .
[0059]
As the laser power during reproduction and recording, laser power control is performed so that predetermined reproduction laser power and recording laser power are stably output. That is, although not shown, a monitor detector in the pickup supplies a laser power monitor signal to the power control circuit in the laser modulation circuit 15, and the power control circuit converts the monitor signal to a reference level (reproduction laser power or recording). The laser power output from the laser diode is stabilized by controlling the output of the laser driving circuit by comparing with the setting level).
Further, the reproducing laser power and the recording laser power must be set to optimum values according to the disk 1. For this reason, for example, when the disc 1 is loaded, the controller 12 performs test writing recording / reproduction on the disc 1 and executes processing for searching for the optimum laser power value. For example, the jitter and error rate are checked while changing the laser power step by step, and the optimum laser power is searched. Then, the searched recording laser power and reproduction laser power as the optimum values are set in the power control circuit in the laser modulation circuit 15 as the reference level. As a result, optimum laser power control is performed during recording and reproduction.
In a dual-layer disc, the optimum laser power is set for each recording layer. Accordingly, processing for setting the optimum laser power is performed for each recording layer.
[0060]
2-2 Judgment processing of user data recording amount
The disc drive apparatus of this example performs recording as described in FIG. 5B or FIG. 6B on the disc 1 having a two-layer structure. That is, on the premise that the amount of user data to be recorded is known, recording that can shorten the recording time and improve the reliability is executed.
However, when the amount of user data to be recorded is unknown, normal recording as shown in FIG. 5A or FIG. 6A is performed.
For this reason, in the recording operation, it is necessary to determine whether or not all user data amounts to be recorded on the disc 1 can be confirmed. An example of processing for this will be described with reference to FIG.
[0061]
The amount of user data to be recorded can be confirmed by a command from the host device.
When the controller 12 receives a recording command from the host device, the controller 12 can confirm the user data amount by the processing as shown in FIG.
[0062]
In step F101, the controller 12 confirms whether or not recording by a session-at-once or disc-at-once method is instructed by a recording command. As already known, in recording by session-at-once or disc-at-once method, after user data is recorded, a closing process is performed to determine the disc contents, and subsequent recording cannot be performed. Therefore, recording by the session-at-once or disk-at-once method is one of the conditions for knowing the user data amount in advance.
If the recording is not based on the session-at-once or disc-at-once method, the possibility of additional recording remains, so the process proceeds to step F106, and the process is terminated because the amount of user data cannot be determined.
[0063]
If the recording instruction is a session-at-once or disk-at-once method, it is determined in step F102 whether additional session recording is permitted. In the case of session-at-once, so-called multi-session recording may be performed. That is, in multi-session recording, even if the current recording is closed as one session, new data can be written as the next session. In such a case, the amount of user data recorded on the disc 1 cannot be determined. Therefore, in step F102, it is determined whether or not additional session recording is permitted (that is, multi-session recording). If it is not permitted, it is single session recording. In this case, new data cannot be recorded after the current recording, so this is also one of the conditions for knowing the amount of user data in advance. If multi-session recording is permitted, the possibility of later additional recording remains, so the process proceeds to step F106, and the process is terminated because the amount of user data cannot be determined.
[0064]
If the disk-at-once method or the session-at-once method is used, and if session addition is not permitted, the recording on the disk 1 is completed by the current recording. Therefore, the amount of user data to be recorded this time is the total amount of user data recorded on the disc 1.
In step F103, it is determined whether a reservation size command is received from the host device as one of the recording commands. The reservation size command is a command for specifying a capacity required for the current recording operation.
If this command has been received, it is checked in step F104 if a valid value is designated as a reservation size command. If so, the amount of user data is determined in step F105. That is, a recording range (capacity) necessary for recording user data on the disc 1 is determined.
[0065]
If the reservation size command has not been issued from the host device, or if a valid value has not been instructed even if it has been issued, the total user data amount cannot be known, so the process proceeds to step F106, and the user data amount The processing is terminated as cannot be determined.
[0066]
In this way, the controller 12 can determine the total amount of user data to be recorded on the disk 1 according to the contents of the recording command from the host device, or it is not determined yet.
Such a command is known as a Mode Slect command which is a standard command represented by, for example, MMC (Multi-Media Commands) or M'tFuji.
For example, FIG. 9 shows a write parameter mode page as one page constituting a recording command. In this page, the 4-bit “Write Type” information is defined at byte position 2, which includes packet write (incremental write), track-at-once, session-at-once / disc-at-once as recording methods. It is information that specifies.
Based on this information content, the determination in step F101 becomes possible.
In addition, information of “Multi-Session / Border” is defined by 2 bits at byte position 3 in FIG. 9, and this is information for designating permission / non-permission of the next session. Based on this information content, the determination in step F102 becomes possible.
[0067]
Further, FIG. 10 shows a reserve track command.
In this reserve track command, a reservation size can be described at byte positions 5 to 8. The host device can reserve a necessary capacity for the disk drive device by describing a valid value as the reservation size and issuing the command.
By issuing the reservation size command, the processing in steps F103, F104, and F105 becomes possible.
Note that the above example is merely an example, and other methods may be used for determination.
[0068]
2-3 Recording area range setting based on recording data volume
Various examples of processing during recording will be described below. First, FIG. 11 shows the processing of the controller 12 for the recording operation for minimizing the lead-out and shortening the recording time as described in FIGS. In other words, this is processing when a recording command is issued from the host device. In each example described below with reference to FIGS. 11 to 14, the disk recording operation of the opposite track path is taken as an example, but all can be similarly applied to the case of the parallel track path.
[0069]
In the case of the example of FIG. 11, when a recording command is issued, the controller 12 determines whether or not the amount of user data to be recorded can be predicted as Step F201. That is, the process of FIG. 8 is performed to determine whether the user data amount is confirmed / unconfirmed.
[0070]
If the amount of user data is not yet determined, the process proceeds to step F204, where the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F205, recording on the disk 1 is started. This means that normal (similar to conventional) recording is performed as shown in FIG.
[0071]
Please refer to FIG. In FIG. 12, STR0 indicates the data recording start position of layer 0, and END0 indicates the maximum position that can be recorded in layer 0. LIMIT0 indicates a position for recording a middle area other than layer 0 user data. Similarly, LIMIT1 indicates the start position of the middle area of layer 1, STR1 indicates the user data recording start position of layer 1, and END1 indicates the final position of layer 1 user data recording.
In this case, the maximum recording capacity that can be recorded on the disk 1 is obtained by adding CAP0 that is in the range of STR0 to END0 and CAP1 that is in the range of STR1 to END1.
By setting the interlayer folding position (interlayer transition position) to the maximum recordable position of layer 0 in step F204, the recording of user data is ended at END0 in layer 0 and thereafter continues from STR1 in layer 1. Will be. In other words, setting the interlayer folding position (interlayer transition position) to the maximum recordable position of layer 0 sets the maximum area range for data recording for layers 0 and 1.
[0072]
If it is determined in step F201 that the user data amount has been determined, the controller 12 determines in step F202 whether or not the entire user data amount can be stored only in layer 0. That is, it is a determination as to whether or not all recording is possible within CAP0 that is in the range of STR0 to END0 in FIG.
If the data amount can be stored only in layer 0, the process proceeds to step F204, and the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F205, recording on the disk 1 is started. That is, recording is performed by treating it as a single-layer disc.
[0073]
However, if it is necessary to use both recording layers for recording the total amount of user data, the process proceeds from step F202 to F203, and approximately half of the amount of user data to be recorded is divided into layer 0 and layer 1. The interlayer folding position is set so as to be recorded.
In other words, the setting of the interlayer folding position in step F203 is to set the area range for recording in layer 0 and layer 1 as a necessary area for approximately half of the user data amount.
[0074]
Then, according to the setting, recording is executed in step F205. In this case, recording is not performed up to the maximum recordable position in layer 0, but a point where half the amount of user data is recorded, that is, a certain point before END0 in the range of STR0 to END0 in FIG. Next, recording on layer 1 is performed.
As a result, recording as shown in FIG. 5B is executed.
Then, as described above, the recording as shown in FIG. 5B based on the setting in step F203 is performed, so that the lead-out area is minimized and the recording time can be shortened.
[0075]
In the example of FIG. 11, the determination in step F202 is performed. However, even when all user data can be recorded in layer 0, the setting in step F203 is performed and user data is stored in layers 0 and 1. You may make it record about half each.
[0076]
2-4 Recording area range setting by recording data amount and OPC result
Next, a recording process for setting a recording area range in consideration of the OPC result in addition to the recording data amount will be described. This is a process mainly from the viewpoint of improving the reliability of the recording operation. In this example, it is assumed that a recording laser power adjustment process (OPC) is performed on each recording layer when the disk 1 is loaded or thereafter at least prior to the recording operation.
[0077]
FIG. 13 shows a processing example. When the recording command is issued, the controller 12 determines in step F301 whether the amount of user data to be recorded is predictable. That is, the process of FIG. 8 is performed to determine whether the user data amount is confirmed / unconfirmed.
If the user data amount is not yet determined, the process proceeds to step F306, where the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F307, recording on the disk 1 is started. In this case, normal recording is performed as shown in FIG.
[0078]
If it is determined in step F301 that the user data amount has been determined, the controller 12 determines in step F302 whether or not the total user data amount can be stored only in layer 0.
In this case, if the user data amount exceeds the data amount that can be stored only in layer 0, the process proceeds to step F306, and the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F307, recording on the disk 1 is started. Also in this case, normal recording is performed as shown in FIG.
[0079]
On the other hand, if the total amount of user data can be stored only in layer 0, it is not necessary to use layer 1 originally, but the process proceeds to step F303 and the OPC result in layer 1 is confirmed. If the OPC result in layer 1 is good, the process proceeds from step F303 to F305, and the interlayer folding position is set so that about half of the amount of user data to be recorded is recorded separately in layer 0 and layer 1. To do.
In the setting of the interlayer folding position in step F305, the area range for recording in layer 0 and layer 1 is set as a necessary area for approximately half of the user data amount.
[0080]
Then, according to the setting, recording is executed in step F307. In this case, recording is not performed up to the maximum recordable position in layer 0, but a point where half the amount of user data is recorded, that is, a certain point before END0 in the range of STR0 to END0 in FIG. Next, recording on layer 1 is performed.
As a result, recording as shown in FIG. 5B is executed.
[0081]
If it is determined in step F303 that the OPC result in layer 1 is not good, the process proceeds to step F304, and recording using only layer 0 is assumed. In step F306, the interlayer folding position (interlayer transition position) is layer 0. Set to the maximum recordable position. In step F307, recording on the disk 1 is started. In this case, normal recording is performed as shown in FIG.
[0082]
According to such processing, when all user data can be recorded in one recording layer, if the OPC in layer 1 is good, half of the recorded data is in layer 0 and the other half is in layer 1 Sort and record. On the other hand, if the OPC result of layer 1 is not good, user data is recorded only in layer 0.
That is, this process is characterized in that the process of whether to perform the recording in the layer 0 or the interlayer folding recording is appropriately switched in consideration of the recording state of the layer 1 (OPC result).
When all the user data can be recorded by one recording layer, using both layers 0 and 1 also means that recording on the outer circumference side of the disc is avoided as much as possible. That is, the disk outer periphery side is greatly affected by the warp of the disk and is easily scratched. Avoiding the disk outer periphery side also improves the reliability of the recorded data.
On the other hand, when the OPC result of layer 1 is not good, the reliability of the recording operation is improved by not using layer 1. In other words, if optimal recording power control (OPC) of the laser to be irradiated when recording information is not optimally performed, jitter will increase when information recorded on the optical disk is subsequently reproduced, and accurate information reproduction will be possible. Although there is a possibility that it will not be performed, such a problem can be avoided beforehand by using this processing.
[0083]
Although the OPC result is added as a condition, it is not limited to OPC, and whether or not layer 1 is good for recording may be determined based on jitter or error rate when test writing data is reproduced.
Further, in the example of FIG. 13, when the total amount of user data to be recorded is within one layer, recording using two layers is performed. For example, both recording layers are used for recording the total amount of user data. 5 is necessary, it is possible to determine which recording is performed as shown in FIGS. 5A and 5B and use the OPC result of layer 1 at that time.
That is, if the OPC result of layer 1 is good, recording is performed as shown in FIG. 5B through the processing of step F305. On the other hand, if the OPC result of layer 1 is not good, the recording amount in layer 1 is as much as possible. With the intention of reducing, recording as shown in FIG. 5A may be performed through the process of step F306.
[0084]
2-5 Recording area range setting by recording data amount and address reading status
Next, a recording process for setting a recording area range (setting an interlayer folding position during recording) in consideration of an address reading situation at the time of recording in addition to the amount of recording data will be described. This is also processing that emphasizes the viewpoint of improving the reliability of the recording operation.
[0085]
FIG. 14 shows a processing example. The process in FIG. 14 is a process after a recording command is issued and the controller 12 starts a recording operation accordingly. For example, the process of FIG. 14 is performed as a periodic interrupt process during the recording operation.
During recording, the controller 12 monitors whether or not the readability of the address information has deteriorated in step F401. As described above, an address is supplied as ATIP data from the reproduction signal processing unit 9 to the controller 12, and the controller 12 monitors the error rate of the address, the error correction result, the address omission status, and the like. Become.
[0086]
If the address reading situation has not deteriorated, the recording proceeds normally. For example, the recording in the method of FIG. For example, it is assumed that the interlayer folding position is the maximum recordable position of layer 0 before the start of recording.
[0087]
If it is confirmed in step F401 that the address reading situation has deteriorated, the controller 12 proceeds to step F402 to check whether the amount of user data to be recorded is known. That is, it is determined from the recording command from the host device whether or not the user data amount has been determined by the processing of FIG.
If the user data amount has not been determined, the process proceeds to step F406, where the maximum recording position of layer 0 is regarded as the interlayer transition position, and the data recording operation is continued in step F407. That is, the recording operation as shown in FIG.
[0088]
On the other hand, when it is determined in step F402 that the amount of user data to be recorded is known, the process proceeds to step F403, where half of the amount of user data to be recorded is recorded in layer 0 and the other half is recorded in layer 1. Assuming the interlayer transition position X.
As an example of recording user data DA1 to DA12 as shown in FIG. 5, the interlayer transition position X is the data amount N [DA12..DA1] = 12, and the recording start position STR0 of layer 0 shown in FIG. Considering
X = STR0 + N [DA12..DA1] / 2-1.
[0089]
Next, in step F404, the interlayer transition position X is compared with the currently recorded position Y. If it has already been recorded up to the position before the interlayer transition position X and is within the maximum recording capacity of layer 0, the process proceeds to step F405. This is the case where more than half of the total user data amount has already been recorded in layer 0 and recording in layer 0 is still being executed.
In this case, the current position Y is regarded as an interlayer transition position in step F405, and recording is continued in step F407. That is, recording at layer 0 is terminated at this point, and recording at layer 1 is continued.
[0090]
In step F404, if the current recording position Y does not exceed the interlayer transition position X, or if recording of layer 1 is already in progress, the process proceeds to step F407 via step F406, and the recording as shown in FIG. Continue operation. If the current recording position Y does not exceed the interlayer transition position X, the process proceeds to step F406. At that time, recording is not performed up to half of the total user data amount. This is because all user data cannot be recorded.
[0091]
According to the above processing, when the address reading situation deteriorates during recording in layer 0, recording is continued in layer 0 if possible and recording is continued in layer 1. When manufacturing an optical disk by bonding optical disk substrates to a recording medium such as an optical disk, deformation such as warpage is likely to occur on the outer periphery, and there is recording film formation unevenness (non-uniformity). When information recorded on the optical disk is reproduced later, jitter increases, and there is a possibility that accurate information is not reproduced. Unless the optical disk is protected by a cartridge or the like, the outer periphery is often damaged by the way the user handles it.
Information recorded on the optical disk should be recorded from a place where there is a high possibility that accurate information will be reproduced when it is reproduced unless necessary.
From this point of view, the processing of FIG. 15 stops recording on the outer peripheral side when the outer peripheral side is not suitable for recording on the basis of the address reading situation, and records on the inner peripheral side as much as possible using layer 1. Will be completed.
Thereby, highly reliable recording is performed.
[0092]
In step F404, if it is determined that the current recording position Y does not exceed the interlayer transition position X, the process proceeds to step F406. In this case, the interlayer folding position X assumed in step F403 is newly set. It is also conceivable to determine such an interlayer folding position and proceed to layer 1 when recording proceeds to the interlayer folding position X.
[0093]
2-6 Recording area range setting with recording data amount and additional information
Next, a recording process for setting the recording area range in consideration of the additional information read from the disk 1 in addition to the recording data amount will be described. This is a process mainly from the viewpoint of improving the reliability of the recording operation. The additional information refers to media information recorded in advance on the disc as, for example, reproduction-only management information. The media information includes a manufacturer code for identifying the manufacturer, a manufacturer ID, a product code, a manufacturing factory ID, a serial number, a manufacturing country / region code, and the like.
[0094]
FIG. 15 shows a processing example. When the recording command is issued, the controller 12 determines in step F501 whether the amount of user data to be recorded is predictable. That is, the process shown in FIG. 8 is performed to determine whether the user data amount is confirmed / undefined.
If the user data amount is not yet determined, the process proceeds to step F507, and the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F508, recording on the disk 1 is started. In this case, normal recording is performed as shown in FIG.
[0095]
If it is determined in step F501 that the user data amount has been determined, the controller 12 determines in step F502 whether or not the total user data amount can be stored only in layer 0.
In this case, if the user data amount exceeds the data amount that can be stored only in layer 0, the process proceeds to step F507, and the interlayer folding position (interlayer transition position) is set to the maximum recordable position of layer 0. In step F508, recording on the disk 1 is started. Also in this case, normal recording is performed as shown in FIG.
[0096]
On the other hand, if the total amount of user data can be stored only in layer 0, layer 1 is not used originally, but layer 1 is also used in some cases.
Therefore, the process proceeds to step F503, and the media information read from the disk 1 is confirmed.
In this case, the controller 12 has a relatively high degree of reliability, particularly in terms of warpage on the outer periphery of the disk and uneven formation of the recording film, depending on the items included in the media information, such as the disk manufacturer, product type, and manufacturing region. Are listed in advance as discs that are considered bad or discs that are not guaranteed by the disc drive device. For example, a list (black list) is created based on a quality survey of various types of discs distributed in the market as having a high possibility of poor quality discs, and stored as list information in a flash memory or the like in the controller 12 Let me. In step F503, such list information is referred to, and the disk 1 From With reference to the read additional information, that is, the media information, it is determined whether or not the currently loaded disc 1 is likely to be a low quality disc listed in the list information.
[0097]
In step F504, it is determined whether or not the currently loaded disc 1 is suitable for recording on the outer peripheral side. In other words, it is determined that the disc is not suitable if it corresponds to the list information in step F503.
If it is determined that there is a high possibility that the disc is not suitable, that is, a bad disc, the process proceeds from step F504 to F506 so that about half of the amount of user data to be recorded is divided into layer 0 and layer 1 and recorded. Next, an interlayer folding position is set.
That is, in the setting of the interlayer folding position in step F506, the area range for recording in layer 0 and layer 1 is set as a necessary area for approximately half of the user data amount. Recording is executed in F508.
In this case, recording is not performed up to the maximum recordable position in layer 0, but a point where half the amount of user data is recorded, that is, a certain point before END0 in the range of STR0 to END0 in FIG. Next, recording on layer 1 is performed.
As a result, recording as shown in FIG. 5B is executed.
[0098]
If it is determined in step F504 that the recording is suitable for the outer side recording, the process proceeds to step F505, where recording using only layer 0 is assumed. In step F507, the interlayer folding position (interlayer transition position) is layer 0. Set to the maximum recordable position. In step F508, recording on the disk 1 is started. In this case, normal recording is performed as shown in FIG.
[0099]
According to such processing, when it is possible to record all user data with a single recording layer and there is a possibility of a disk with low quality on the outer peripheral side, half of the data to be recorded is layer 0. The other half is allocated to layer 1 and recorded. On the other hand, if there is no problem in recording on the outer peripheral side, user data is recorded only on layer 0.
In other words, this process considers the statistical quality of the disc and determines whether there is anxiety about the recording on the outer peripheral side, and appropriately determines whether to perform the recording within the layer 0 or the interlayer folding recording. It is characterized by switching to.
And for discs that are uneasy about quality, recording on both the layers 0 and 1 can avoid recording on the outer circumference side of the disc as much as possible, and even a disc with a low degree is as reliable as possible. The recording which gave the character becomes possible.
[0100]
In the example of FIG. 15, when the total amount of user data to be recorded is within one layer, and when there is anxiety about quality, recording using two layers is performed. For example, even when both recording layers are required for recording the total amount of user data, it is determined which recording is performed as shown in FIGS. 5A and 5B, and additional information read from the disk is used at that time. A process to perform is also conceivable.
That is, the determination in step F502 is eliminated, and a disc with uncertain quality is recorded as shown in FIG. 5B after the processing in step F506 regardless of whether or not the total amount of user data can be recorded in one recording layer. On the other hand, for a disc that is not worried about quality, recording as shown in FIG. 5A may be performed through the processing of step F507.
[0101]
3. Modified example
Although the embodiment has been described above, various modifications and application examples as the present invention are conceivable.
First, DVD + R was mentioned as a DVD type two-layer recordable type disc. Of course, similarly to DVD-R, DVD + RW, DVD-RW, DVD-RAM, etc. An interlayer transition position (that is, an area range in which data is written for each recording layer determined by the interlayer transition position) is set according to the amount of user data to be recorded, the OPC result, the address reading status, additional information, and the like. Is preferred.
[0102]
In addition, the present invention is useful as a recording medium having a plurality of recording layers, not limited to DVD disks, but also other types of disks such as CD and Blu-ray disks, and media other than disks.
Furthermore, although the dual-layer disk is used in the embodiment, it goes without saying that the present invention is suitable for a recording medium having three or more recording layers.
[0103]
【The invention's effect】
As can be understood from the above description, in the present invention, it is possible to appropriately set an area range in which data is written for each recording layer based on the total amount of data to be recorded on the recording medium having a multilayer structure. This has the effect of realizing a simple data writing operation.
In particular, if the area range in which data is written is set so that the recording amount of the termination area (leadout) formed for reproduction compatibility is minimized, the time required for recording the termination area can be shortened. This is very effective in terms of shortening the recording operation time, and is particularly noticeable in a situation where a lot of areas are generated due to a large capacity multilayer recording medium.
[0104]
Further, in the case of a multilayer recording medium having a large capacity, when there is no need (that is, when recording without using a full capacity), there is a high possibility that accurate information reproduction is performed when reproducing as much as possible. It is better to record from the location, but based on the total amount of data to be recorded, it is possible to realize a highly reliable data writing operation by setting the area range for writing data for each recording layer .
[0105]
That is, if the area range in which data is written is set based on the detected total data amount and the result of the recording laser power adjustment in each recording layer, for example, a recording layer in which the recording laser power adjustment is difficult can be avoided. Recording can be performed.
In the case of a multilayer recording medium, fine adjustment is required for adjusting the recording laser power in each recording layer. However, depending on the case, a recording layer in which the optimum laser power value cannot be found may occur. In such a state, it is appropriate to improve the stability and reliability of the recording and the subsequent reproducing operation so that the data recording is performed so as to avoid the recording layer where the optimum laser power value cannot be found.
[0106]
In addition, setting the area range for writing data based on the total amount of data detected and the monitoring status of the address read state from the recording medium during the recording operation can be performed during the recording. When there is a recording layer that cannot be recorded, recording can be performed so as to avoid continuation of recording in the recording layer. Therefore, it is possible to continue recording using a stable area, which is also suitable for improving the stability and reliability of recording and subsequent reproduction operations.
[0107]
Furthermore, if an area range in which data is written is set based on the total amount of data detected and additional information read from the recording medium, the recording layer can be used flexibly according to individual circumstances of the recording medium. Recording is possible. For example, disc warpage, recording film molding unevenness, or scratches caused by handling by a user on a low-quality disc will have a large effect on the outer periphery of the disc. This is also suitable for improving the stability and reliability of recording and subsequent reproduction operations.
[0108]
In the case of a disc-shaped recording medium, main data (user data) is stored in each recording layer. diameter When recording to a position of less than 68 mm, at least the lead-out area or the middle area that replaces the lead-out area diameter The first condition of forming up to a position of 70 mm and the main data is diameter From 68mm diameter When recording up to a position between 115 mm, from the end of the main data recording Radially The second condition that the lead-out area or middle area is formed in the range of 2 mm, and the main data is diameter From 115mm diameter When recording up to a position between 116 mm, at least from the recording end of the main data diameter A recordable DVD system by setting an area range in which data is written in each recording layer so as to satisfy either of the third conditions of forming a lead-out area or a middle area in a range up to 117 mm Therefore, the compatibility of the discs can be maintained, and the present invention can be used effectively.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an area structure of a disc and a PSN.
FIG. 2 is an explanatory diagram of a dual-layer disc.
FIG. 3 is an explanatory diagram of a parallel track path.
FIG. 4 is an explanatory diagram of an opposite track path.
FIG. 5 is an explanatory diagram of a recording operation in the case of an opposite track path according to the embodiment.
FIG. 6 is an explanatory diagram of a recording operation in the case of a parallel track path according to the embodiment.
FIG. 7 is a block diagram of the recording / reproducing apparatus according to the embodiment.
FIG. 8 is a flowchart of user data recording amount determination processing according to the embodiment;
FIG. 9 is an explanatory diagram of a write parameter command.
FIG. 10 is an explanatory diagram of a reservation size command;
FIG. 11 is a flowchart of a data recording process by setting an area range based on a recording data amount according to the embodiment.
FIG. 12 is an explanatory diagram for comparing the amount of recording data and the recording layer capacity according to the embodiment.
FIG. 13 is a flowchart of a data recording process based on an area range setting based on a recording data amount and an OPC result according to the embodiment.
FIG. 14 is a flowchart of a data recording process by setting an area range based on a recording data amount and an address reading situation according to the embodiment.
FIG. 15 is a flowchart of a data recording process by setting an area range based on a recording data amount and additional information according to the embodiment.
[Explanation of symbols]
1 disk, 2 spindle motor, 3 optical pickup, 8 RF amplifier, 9 reproduction signal processing unit, 10 servo control unit, 11 DRAM, 12 controller, 13 host interface, 14 modulation unit, 15 laser modulation circuit

Claims (7)

The data area has a plurality of recording layers into which data can be written, and includes a data area that includes main data, a preceding area that precedes the data area, and a termination area that follows the data area. In a recording apparatus for a DVD-type disc-shaped recording medium in which a lead-out area or middle area added at the end or midway is formed,
Recording means for recording data on each recording layer;
A data amount detecting means for detecting the total amount of data to be recorded on the recording medium;
An area in which data is written for each recording layer so that the recording amount of the termination area formed for reproduction compatibility is minimized based on the total amount of data detected by the data amount detection means. Control means for setting the range and controlling the data writing operation;
With
The control means for each recording layer,
When the main data is recorded up to a position with a diameter of less than 68 mm, a first condition that a lead-out area or a middle area replacing the lead-out area is formed to a position with a diameter of at least 70 mm;
When the main data is recorded at a position between 68 mm and 115 mm in diameter, the lead-out area or the middle area is formed in a range of 2 mm in the radial direction from the recording end of the main data. And the conditions
When the main data is recorded to a position between a diameter of 115 mm and a diameter of 116 mm, the lead-out area or the middle area is formed in a range from the recording end of the main data to at least a diameter of 117 mm. In order to satisfy one of the three conditions, an area range in which data is written in each recording layer is set,
While performing control for recording laser power adjustment in each recording layer,
A recording apparatus for setting an area range in which data is written for each of the recording layers based on the total amount of data detected by the data amount detection means and the result of the recording laser power adjustment.   The recording apparatus according to claim 1, wherein the termination area is a lead-out area. The control means monitors the address reading state from the recording medium during the recording operation,
2. An area range in which data is written for each of the recording layers is set based on the total amount of data detected by the data amount detection means and the monitoring status of the address reading state. The recording device described in 1.   The control means performs data for each recording layer based on the total data amount detected by the data amount detection means and the media information of the recording medium that has been recorded in advance and read from the recording medium. The recording apparatus according to claim 1, wherein an area range for writing is set. The data area has a plurality of recording layers into which data can be written, and includes a data area that includes main data, a preceding area that precedes the data area, and a termination area that follows the data area. As a recording method for a DVD-type disc-shaped recording medium in which a lead-out area or middle area added at the end or midway is formed,
Detect the total amount of data to be recorded on the recording medium,
Based on the total amount of data detected, data is set by setting an area range in which data is written for each recording layer so that the recording amount of the end area formed for reproduction compatibility is minimized. Performing writing, setting the range of data to be written for each recording layer based on the total amount of data detected and the result of recording laser power adjustment in each recording layer ,
The region range is
When the main data is recorded up to a position with a diameter of less than 68 mm, a first condition that a lead-out area or a middle area replacing the lead-out area is formed to a position with a diameter of at least 70 mm;
When the main data is recorded at a position between 68 mm and 115 mm in diameter, the lead-out area or the middle area is formed in a range of 2 mm in the radial direction from the recording end of the main data. And the conditions
When the main data is recorded to a position between a diameter of 115 mm and a diameter of 116 mm, the lead-out area or the middle area is formed in a range from the recording end of the main data to at least a diameter of 117 mm. A recording method set in each of the recording layers so as to satisfy any one of the three conditions.   6. The area range in which the data is written is set based on the total amount of data detected and a monitoring state of an address reading state from a recording medium during a recording operation. Recording method.   The setting of the area range in which the data is written is performed based on the total data amount detected and the media information of the recording medium recorded in advance read from the recording medium. Item 6. The recording method according to Item 5.

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