JPH076368A - Optical disk device and recording/reproducing method - Google Patents

Abstract

PURPOSE:To shorten a processing time of reading in reproducing by controlling a first and a second recording/reproducing means, making a series of data by integrating and arranging reproduced data respectively. CONSTITUTION:An error correcting code is added to data sent from a host computer in recording by an error correcting circuit 110, and the data is stored in a RAM 109. At the same time, it is converted to an optimum signal for recording in an optical disk 101 by a controller 108, distributed equally to laser power control circuits A104, B105, modulates laser power of optical heads A102, B103, and records in the A plane and the B plane of the disk 101. When a data error of a sector read out is impossible to correct, the sector is made a defective, or recorded data of a corresponding sector of a plane having no defective sector out of the A plane and the B plane is recorded in a prescribed region. Since data recorded in the A plane or the B plane of the disk 101 is read out by pickups A113, B 114, integrated, arranged and made a series of data, a processing time the reading in reproducing can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device and a recording / reproducing method in the device, and more particularly to a process for replacing an optical disc for double-sided recording.

[0002]

2. Description of the Related Art The format of an optical disk will be described. FIG. 8 shows an example of a format including a spare area of an optical disc. In FIG. 8, the up-down direction indicates the inner and outer circumferences of the track, and the left-right direction indicates the array direction of the sectors.

As shown in the figure, a map area 8 for recording the information of the alternative process is provided from the 0th track to the ith track.
01, the data area 802 for recording normal recording data from the i + 1 track to the j track, and the data area 8 from the j + 1 track to the k track.
02 is a spare area 803 in which a replacement sector for replacement recording when a defective sector exists is present, and k +
The map area 804 is from the 1st track to the nth track.

To record data on a rewritable optical disk, the same sector is usually irradiated with a laser beam twice or three times. In the case of an overwritable optical disc, the first irradiation is for searching the target address in the data area 802 and recording the data in the target sector, and the second irradiation is for verifying the recorded data. The purpose is to read the data recorded at the target address. Further, in the case of an optical disc which cannot be overwritten, a laser beam for erasing a target address is irradiated before recording data.

In this recording operation, when an error occurs in the verify operation, or when a recording error such as a track jump or an address read error occurs during recording and normal recording cannot be performed, a recording error occurs. Treat the recorded target sector as a defective sector,
An alternative process of recording this recording data in the alternate sector of the spare area 803 is performed. When such a replacement process is performed, a flag indicating that the sector is defective is written in the defective sector. Then, in the map area 801, information for clarifying the replacement sector in which the defective sector alternative recording is performed is recorded. As shown in FIG. 8, map areas 801, 80
Usually, 4 are arranged at a plurality of positions on the innermost and outermost sides of the optical disc, and the same information is multi-recorded for improving reliability.
When reproducing the data subjected to the alternative processing, first, by reading the information of the alternative recording in the map area 801,
The CPU recognizes the address of the alternate sector in which the data is recorded. Then, the search order is grasped, and the optical head is controlled to read the data.

[0006]

DISCLOSURE OF THE INVENTION In an optical disk apparatus capable of simultaneous double-sided recording / reproduction in an optical disk capable of double-sided recording, the transfer system of the optical heads on both sides operates in conjunction with the radial direction of the optical disk. It is assumed that there is a defective sector on either side of the double-sided recording optical disc at the time of recording, and the defective sector replacement processing is performed only on that side.
At the time of reading the recorded data, when reading the alternate sector on which the alternative recording has been performed, the optical head will be located in the alternative area even on the surface on which the alternative recording is not performed. However, it is necessary to wait for the process of interrupting the soaking operation, so that the processing time of the data reproduction is delayed.

The present invention has been made in view of the above problems of the prior art.
It is an object of the present invention to provide a double-sided simultaneous recording / simultaneous reproduction optical disk device and a recording / reproducing method for shortening the read processing time when reproducing the data in a double-sided recordable optical disk when alternative recording of a defective sector is performed. And

[0008]

An optical disk device according to the present invention is an optical disk device in which an optical disk having two surfaces on which simultaneous recording is possible and a spare area for alternative recording is used on both surfaces is used. Means for distributing a series of data to be recorded into first data to be recorded on a first surface of the two surfaces and second data to be recorded on a second surface of the two surfaces, and the first surface A first recording / reproducing means for recording / reproducing the first data, a second recording / reproducing means for recording / reproducing the second data on / from the second surface, and Detecting means for detecting a non-recordable defective sector that has occurred on any of the two surfaces, and recording data of the detected defective sector,
And recording data of the corresponding sector corresponding to the defective sector on the surface of the two surfaces which is not the surface having the defective sector is subjected to the alternative recording process on the alternate sector of the spare area of each of the two surfaces, And the control means for controlling the first recording / reproducing means and the second recording / reproducing means so that the defect information on the defective sector is recorded in a predetermined area of the optical disc, and the first recording / reproducing means reproduces the information. The above-described object is achieved by the data integration means for integrating and arranging the first data and the second data reproduced by the second recording / reproducing means into the series of data.

Each time the detecting means detects a defective sector, the control means may perform the alternative recording of the defective sector and the corresponding sector corresponding to the defective sector. The control means records data to the defective sector generated for the recording of the series of data, and to a sector corresponding to the defective sector on a surface of the two surfaces which is not the surface having the defective sector. It is also possible to provide a first storage unit for temporarily storing the record data of No. 1, and control the record data stored in the first storage unit so as to collectively perform the alternative recording process for the series of data.

The data integration means may sequentially integrate and arrange the reproduced first data and the reproduced second data.

The data integration means comprises second storage means for temporarily storing the data read from the optical disc, and the data storage means stores the data stored in the second storage means and the data read from the optical disc. Of these, data not stored in the second storage means may be integrated and arranged.

The data integrating means includes second storage means for temporarily storing the data read from the optical disk, and the first reproducing data and the reproduced second data are successively integrated and arranged. And a second function of integrating and arranging the data stored in the second storage means and the data read from the optical disk that is not stored in the second storage means. Means for reading the defect information recorded from a predetermined area to detect an alternative processing amount, and switching between the first function and the second function of the data integrating means according to the detected alternative processing amount. Means may further be provided.

Means may be further provided for moving the first recording / reproducing means and the second recording / reproducing means with respect to the optical disc.

Means for performing focus control and tracking control independently of the two surfaces of the optical disk may be further provided.

The control means may control to record the defect information at the same position in the radial direction and the tangential direction of the optical disk on the two surfaces.

The detection means has a third storage means for temporarily storing data to be recorded on the optical disc, reproduces the data recorded on the optical disc, and stores the reproduced data and the third storage means. The defective sector may be detected by comparing the data with the data.

The recording / reproducing method of the present invention records a series of data on an optical disc having two surfaces on which simultaneous recording is possible, and each of the two surfaces has a spare area for alternative recording.
A method of managing a defect of the optical disc during reproduction, wherein the recording step includes first data for recording the series of data to be recorded on a first surface of the two surfaces and one of the two surfaces. Distributing the second data to be recorded on a second surface, recording the first data on the first surface, and simultaneously recording the second data on the second surface, A step of detecting a non-recordable defective sector generated on any one of the two sides during simultaneous recording on the two sides; recording data of the detected defective sector; A step of performing an alternative recording process of recording data of a corresponding sector corresponding to the defective sector on a surface which is not the surface having the defective sector to a replacement sector of each of the spare areas of the two surfaces; Recording the recess information in a predetermined area of the optical disc, and the reproducing step reproduces the first data from the first surface and reproduces the second data from the second surface; The step of integrating and arranging the first data and the reproduced second data into a series of data is carried out, whereby the above object is achieved.

[0018]

According to the present invention, when a recording error occurs due to a defective sector on either surface of an optical disk for double-sided recording at the time of simultaneous double-sided recording, even if the recording sector on the other surface is a normal sector, it is unconditional. Alternate processing is performed and the data written on that side is recorded in the alternate sector. When reproducing this data, the data written in this alternate sector is accessed on both sides.

According to the above method, in the replacement processing of the defective sector in the optical disk apparatus of the double-sided head which performs simultaneous double-sided optical disk and double-sided recording / reproduction, it is possible to eliminate the waiting time for the data reading of the alternate sector and minimize the processing time. Become.

[0020]

EXAMPLES The present invention will be described below based on examples. (Embodiment 1) FIG. 1 is a block diagram showing a simple circuit configuration of an optical disk device having a double-sided optical head in Embodiment 1 of the present invention. The configuration of the optical disk device of this embodiment will be described with reference to FIG.

This optical disk device is used for an optical disk 101 for double-sided recording, and includes an optical head A102, an optical head B103, a laser power control circuit A104, a laser power control circuit B105, a servo driver 106,
And a servo controller 107. Optical head A
102 performs recording and reproduction on the A side of the optical disc 101,
The optical head B103 performs recording / reproduction on the B side of the optical disc 101. The laser power control circuit A104 controls the laser power of the optical head A102, and the laser power control circuit B105 controls the laser power of the optical head B103. The servo driver 106 uses the optical head A1.
No. 02 actuator, the optical head B103 actuator, and the optical head transfer base are driven. The optical head transfer base transfers the optical head A102 and the optical head B103 in conjunction with each other. The servo controller 107 controls the servo driver 106.

This optical disk device further includes a pickup A113, a pickup B114, and a preamplifier A1.
15, preamplifier B116, analog signal processing circuit A1
17 and an analog signal processing circuit B118.
The pickup A113 takes out information from the A side of the optical disc 101, and the pickup B114 is the optical disc 1
Information is taken out from the B side of 01. Preamp A115
Amplifies the signal extracted from the pickup A113, and the analog signal processing circuit A117 processes the analog signal from the preamplifier A115 and binarizes it. The preamplifier B116 amplifies the signal taken out from the pickup B114 and outputs the analog signal processing circuit B118.
Processes the analog signal from the preamplifier B116 and binarizes it.

The optical disk device further includes a sector format controller 108, a RAM 109, an error correction circuit 110, a CPU 111, and a drive controller 112. The sector format controller 108 reads an address from the optical disc 101, modulates and demodulates data, and the like. The sector format controller 108 is a laser power control circuit A10.
4, the laser power control circuit B105 and the servo controller 107 are controlled to control the analog signal processing circuit A1.
Output signals from 17 and the analog signal processing circuit B118 are input. The RAM 109 stores recording data and read data. The error correction circuit 110 adds an error correction code to the recorded data and corrects the read data. The CPU 111 includes a servo controller 107, a sector format controller 108,
Error correction circuit 110 and drive controller 1
Control twelve. The drive controller 112 controls driving of the optical disc device. This optical disc device
Connected to the host computer.

The data flow in the optical disc device having such a configuration will be described with reference to FIG.

At the time of recording, the data sent from the host computer is sent to the error correction circuit 110.
The data is processed by the error correction circuit 110, for example, by the well-known Reed Solomon Code (Reed Solomon Code).
An error correction code that is a redundant word for error detection such as e) is added. Data with error correction code is R
It is stored in the AM 109 and is simultaneously transmitted to the sector format controller 108. The data is converted into a signal optimum for recording on the optical disc 101 by the sector format controller 108, for example, (2,7) modulated, and is stored in the laser power control circuit A 104 and the laser power control circuit B 105 for each sector byte length. Evenly distributed to. The distributed data are respectively recorded in the optical head A.
By modulating the laser power of the optical head 102 and the optical power of the optical head B103, recording is performed on the A surface and the B surface of the optical disc 101, respectively.

Next, the recorded data is read out for any error and is verified. Verify is RA
The recording data stored in M109 and the optical disc 1
This is to determine whether or not the data could be normally recorded by comparing the reproduction data read from 01 and subjected to error correction. At the time of this verification, if the data of the read sector cannot be error-corrected, the sector becomes a defective sector.

This verification will be described in more detail. The data on the A side and B side of the optical disc 101 are read by the pickup A113 and the pickup B114, respectively. The read data of A side and B side are
Preamplifier A115 and preamplifier B116 respectively amplify. Further, the amplified data on the A side and B side are binarized by the analog signal processing circuit A 117 and the analog signal processing circuit B 118, respectively, and sent to the sector format controller 108. The sector format controller 108 reads the address and the data and outputs the signal recorded on the optical disc 101 to the NR.
Demodulate to Z data. Further, the demodulated A-side and B-side data are arrayed, integrated into one data, and transmitted to the error correction circuit 110. The reproduction data sent to the error correction circuit 110 is compared with the recording data stored in the RAM 109 at the time of recording, and if the data match, the recording of the next data is continued. As a result, the data is alternately recorded in the alternate sector of the optical disc 101.

According to the present invention, in this alternative processing, if either side A or side B of the optical disk 101 cannot be normally recorded due to a defective sector or the like,
Substitution processing is performed on both sides.

Next, the structure of the double-sided optical head unit in the optical disk device of this embodiment will be described in more detail with reference to FIG. FIG. 2 is a simple configuration diagram of the double-sided optical head unit in this embodiment.

As shown in FIG. 2, the double-sided optical head unit includes actuators 201, 202, a transfer table 203, a guide shaft 203, a roller 205, and an objective lens 20.
6 is provided. Each of the actuators 201 and 202 is equipped with an objective lens 206 and a moving part thereof. The double-sided optical disc is inserted between the actuators 201 and 202.
The objective lens 206 focuses the laser beam from the semiconductor laser on the optical disc. The pair transfer table 203 is
The actuators 201 and 202 are moved in the disk radial direction by the roller 205 along the guide shaft 204. The actuator 201 and the actuator 202 are fixed to the transfer table 203, and the structure is such that the movement in the radial direction moves in conjunction with the transfer table 203. That is, in the search operation, both the actuator 201 and the actuator 202 simultaneously move in the same direction by the same distance. Further, the control of focus and tracking is performed independently by the actuator 201 and the actuator 202. Therefore, even in an optical disc in which the address of the A side and the address of the B side, which will be described later, are arranged at the same position, independent focus and tracking control for each surface, which is necessary due to a slight positional deviation between the surfaces. Will be possible.

In this optical head portion, when the double-sided optical disk is inserted between the actuator 201 and the actuator 202, the disk surface on the actuator 201 side is the A surface and the disk surface on the actuator 202 side is the B surface. Further, the spindle motor for rotating the optical disc 101 rotates in both the clockwise direction and the counterclockwise direction in consideration of the reverse insertion of the A surface and the B surface.

Next, the format of the double-sided optical disk according to the present invention will be described with reference to FIG. FIG. 3 shows an example of a schematic view of surfaces A and B of a double-sided optical disk.

As shown in FIG. 3, the surface A has tracks spirally formed in a clockwise direction from the inside of the disk, 0 tracks and 0 sectors from the inside of the disk, and the outermost circumference is m.
The track and the last sector are n sectors. The B side has a track formed in a spiral shape in a counterclockwise direction from the inside of the disk, and the other formats are exactly the same as those of the A side. The same address on the A side and the B side are physically the same position. So that both sides are attached together. That is, when both sides are simultaneously accessed, the target sector on each side always has the same address.

Here, for the sake of simplification, a total of 10 sectors of data are simultaneously recorded on both sides of 5 sectors from p sector to p + 4 sector on the A and B sides of the optical disk shown in FIG.
The recording / reproducing operation when the p + 2th sector on the A side is a defective sector will be described with reference to FIG. Figure 4
6 is a flowchart showing an example of an operation of a substitution process in the present embodiment.

When the recording operation is started in step S401, first, the recording data to which the error correction code is added by the error correction circuit 110 is stored in the RAM 108.
At the same time, the recorded data is stored in the format controller 108.
And is evenly distributed to the A side and the B side of the optical disc 101. Next, in step S402, the actuator 2
01 and the actuator 202 are respectively the optical disc 1
Simultaneous recording is started on the A-side p sector of 01 and the B-side p sector.

When the recording is completed up to the p + 4 sector on the A side and the p + 4 sector on the B side, it is verified in step 403 whether or not the A side and the B side are normally recorded. That is,
The following processing is performed. First, the simultaneously recorded data from the p side sector A to p + 4 sector and the recorded side B sector p to p + 4 sector are simultaneously read. And CPU
By the command of 111, it is confirmed whether the reproduction data and the recording data stored in the RAM 109 match.

By the verification in step S403,
For example, if it is detected that the reproduced data of the p + 2 sector of the A side does not match the recorded data, the process proceeds to step S4.
Proceed to 06 to enter the sequence of alternative processing. Step S
The alternative process in 406 is that the p + 2 sector of the A side is simultaneously processed with the p + 2 sector of the B side regardless of the recording state of the p + 2 sector of the B side.
Do it in +2 sectors. First, according to a command from the CPU 111, a flag indicating that the sector is defective is written in the p + 2 sector on the A side and the p + 2 sector on the B side. According to the optical disk device of this embodiment, it is not always necessary to write this flag. Then, the alternate sector for the alternative recording is designated, for example, the q sector of the spare area is designated. Actuator 201 and actuator 202
And move to the q sector of the A side and the B side, respectively.
Substitute recording of data to be recorded in the A-side p + 2 sector stored in the RAM 109 into the A-side q sector and data to be recorded in the B-side p + 2 sector into the B-side q sector.
Do 6. Also in this recording operation, step S407
Then, as in the normal recording operation, it is verified whether or not the data can be normally recorded in the A-side q-sector and the B-side q-sector. If both sides have been recorded normally, the process proceeds to step S408.
Proceed to step A, the information of this alternative process (defect information)
Record in each map area of the surface. Therefore, side A,
The defect information written in each map area of the B side is the same. The defect information is, specifically, a table of physical existence addresses of defective sectors and address information of replacement sectors corresponding to the defective sectors. Therefore, the defect information recorded in the map area in this case indicates the address of the defective sector and the address at which the data of the defective sector A side p + 2 sector and B side p + 2 sector are written instead. is there.

In step S407, if data is not normally recorded in at least one of the A-side q sector and the B-side q sector, the process proceeds to step S406.
In step S406, similarly to the case of the p + 2 sector described above, for example, the data of the A-side q-sector and the B-side q-sector are alternately recorded on the A-side q + 1 sector and the B-side q + 1 sector, respectively. In this way, the alternative recording is repeated until recording is normally performed on both sides A and B, and the processing shifts to the normal recording operation only when normal recording is performed on both sides A and B.

After that, in step S404, if there is other recording data, the process proceeds to step S405 to continue recording, and if there is no other recording data, the process proceeds to step S409 to finish recording.

When reproducing the data of the optical disc 101 recorded according to the flow of the recording operation of FIG. 4, the map area is read to obtain the replacement information of the defective sector. At this time, assuming that the alternative recording is performed only on the A side at the time of recording as in the conventional case, since the optical head A 102 and the optical head B 103 move in association with each other, the replacement sector is moved to the A side. Side B must wait for processing while being read. Therefore, the processing time for reproduction becomes long. In the present embodiment, p + 2 sectors are recorded in the alternate sector q on both sides, so by reading q sectors on both sides, the processing time for waiting for processing on one side is minimized.

Furthermore, in this embodiment, each time data is read in order, that is, each time the defective sector is read, the data that should have been recorded in the defective sector is recorded in the alternate sector. read out. Therefore, in the sector format controller 108,
There is no need to rearrange the data read from each sector in order, the structure of the sector format controller 108 can be simplified, and the reproduction processing time in the sector format controller 108 is shortened.

In this embodiment, an example of an optical head and an actuator whose transfer system works together, a format of a double-sided optical disk, a method of distributing and reproducing data, etc. is described. It can also be applied to optical discs in which the two sides are physically displaced, and different data structures. (Embodiment 2) An optical disk device according to Embodiment 2 of the present invention will be described below with reference to FIG. FIG. 5 is a block diagram showing the configuration of the optical disk device of this embodiment. 5, the same components as those of the optical disc device of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In addition to the components of the optical disc device of the first embodiment, the optical disc device of the present embodiment has an error correction circuit 1.
RA for storing the data of the defective sector connected to 10
A RAM 1 for temporarily storing reproduction data, which is connected to the M119 and the sector format controller 108.
And 20.

The structure of the optical head section and the structure of the optical disk are the same as in the first embodiment. First, the recording operation of this embodiment will be described. For simplification, recording is performed, for example, for a total of 40 sectors from 1 sector on each side to 20 sectors, and one continuous recording is assumed to be 10 sectors on each side, and the defective sector is the third sector on the A side. , 5th sector and 15th sector.

In the recording operation, first, data for 20 sectors is added with an error correction code by an error correction circuit. The data to which the error correction code is added is RAM1.
09, and simultaneously transmitted to the sector format controller 108. The sector format controller 108 converts the data into the optimum signal to be recorded on the disc, and distributes the data to each of the 10 sectors of A side and B side. The distributed data is recorded on the A side and the B side of the optical disc 101 by the laser power control circuit A 104 and the laser power control circuit B 105, respectively. When recording for 10 sectors is completed,
Next, the recorded data is read out and the error correction circuit 11
Error correction by 0, and the data after error correction,
It collates with the data stored in the RAM 109.
At this time, it is assumed that the data of the third sector and the fifth sector of the A side do not match. In that case, the data of the third and fifth sectors of the A side, and the data of the third and fifth sectors of the B side which were normally recorded can be stored in the RAM 119.
To store.

Next, recording is performed for each 10 sectors from the 11th sector to the 20th sector on the A side and B side of the optical disc 101. The RAM 109 is cleared and new recording data is stored in the RAM 109. The recording data is recorded in the 11th sector to the 20th sector of the A side and B side of the optical disc 101 in the same manner as described above. When the recording is completed, the recorded data is read out and collated with the data stored in the RAM 109. By matching,
If the 15th sector data on the A side does not match, the 15th sector data on the A side and the 15th sector data on the B side are stored in the RAM 119.

Next, alternative recording of the defective sector data stored in the RAM 119 is recorded in the alternate area of the optical disc 101. The third sector, the fifth sector, the fifteenth of the A side
Sector, and the third, fifth, and fifteenth sectors on the B side
The recording data of the sector is recorded in alternating areas, for example, q sector, q + 1 sector, q + 2 sector of A side, and q sector, q + 1 sector, q + 2 sector of B side, respectively. Also in this case, the recorded data is collated, and if the recorded data and the read data match, the data recording operation ends.

Finally, the information (defect information) of these alternative recordings is recorded in the map area. As shown in FIG. 3, the map area is set at the same position on the A surface and the B surface. Since the user data is subjected to exactly the same alternative recording process on both sides A and B, the defect information recorded in the map area is the same data on sides A and B. At this time, it is not necessary to record the same data in a plurality of areas on each surface as in the conventional case. Conventionally, since the defect information is different between the A side and the B side, it is necessary to perform multiple recording in a plurality of areas in order to protect the data recorded in the map area. This is because the same data is used for both the surface and the surface B, so that even if the data for the map area for the surface A is damaged, the data for the map area for the surface B can be used. That is, the same effect as multiple writing can be obtained by one recording operation, the defect information recording time in the map area can be shortened, and the map area per one side can be reduced, so that the data area can be effectively used. Can be used. When the recording of the information for the alternative process in the map area is completed, all the recording operations are completed.

Next, the reproducing operation will be described. In the reproducing operation, first, the map area is read and the defect information, that is, the address of the defective sector and the address of the alternate sector thereof are recognized. Then, the information from the first sector to the twentieth sector of the A side and B side is read. The read data is first stored in the RAM 120. Next, the q sector, q + 1 sector, of each of the alternating sectors A and B,
And read the q + 2 sector. The sector format controller 108 arranges the reproduction data stored in the RAM 120 and the reproduction data read from the alternate sector based on the defect information read from the map area, and
The continuous data is transmitted to the error correction circuit 110. The transmitted reproduction data is further transmitted to the host computer via the drive controller 112.

As described above, in the reproducing method of this embodiment,
By collectively reading the data in the data area and the data in the alternate area, the number of search operations is reduced and the reproduction processing speed is increased particularly when reproducing data having a large amount of substitution processing. Such a reproducing method can be applied even when the collective recording as in the present embodiment is not performed at the time of recording. (Embodiment 3) The processing and configuration of the reproducing system of the optical disk device in Embodiment 3 of the present invention will be described below with reference to FIG. FIG. 6 is a block diagram showing the configuration of the reproduction system of the optical disc apparatus of this embodiment. 6, the same components as those of the optical disc apparatus of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

A reproducing operation in the optical disk device of this embodiment will be described. The reproduction process of the optical disc 101 starts with the reading of the map area in which the information (defect information) of the alternative recording is recorded. When you read the information in the map area, CP
U111 detects the alternative processing amount of the data to be reproduced, and according to the alternative processing amount, the reproduction method of the first embodiment and the second embodiment.
Switching between two types of playback methods, i.e.

In the reproducing method according to the first embodiment of the present invention,
The processing in the sector format controller 108 is A
This is a simple process of arranging the side data and the side B data every other sector. However, since a replacement sector is searched for each defective sector, it is conceivable that the reproduction processing time by the search processing will increase if the amount of alternative recording is large.

In the reproducing method according to the second embodiment of the present invention,
Since the alternate sectors are collectively read, the search operation can be performed once or several times, and the search time can be reduced. However, the process of the sector format controller 108 is a complicated process of rearranging the data in the normal data area and the data in the alternate sector and arranging the A-side data and the B-side data every other sector. Therefore, when the amount of alternative recording is small, the reproduction processing time in the sector format controller 108 becomes long.

FIG. 7 shows the relationship between the number of substitution processes and the reproduction processing time in each case of the reproduction method of the first embodiment and the reproduction method of the second embodiment. In FIG. 7, a line 701 shows the relationship between the number of alternative processes and the reproduction processing time in the reproducing method of the first embodiment, and a line 702 shows the relationship between the number of alternative processes and the reproduction processing time in the reproducing method of the second embodiment. Show. Here, it is assumed that the number of sectors to be read is the same in each reproducing method. In addition, the number of substitution processes at the intersection of the line 701 and the line 702 is represented by x.

In the present embodiment, the CPU 111 recognizes the number of times of the alternative process from the alternative information (defect information) of the map area, and if the number of the alternative processes is equal to or less than the value x (smaller), the case of the first embodiment is performed. If the number of times of the alternative process is larger than the value x (if it is larger than the value x), the servo controller 107 and the sector format controller 108 are instructed to perform the reproduction by the method of the second embodiment, thereby performing the reproduction. Switch the processing method.

This value x can be easily recognized by the CPU 111 by pre-storing it in a ROM (not shown) accessed by the CPU 111, for example.

This value x also differs depending on the position of the spare area on the optical disc 101. This is because the time required for one substitution process varies depending on the position of the spare area, and thus the relationship between the number of substitution processes and the regeneration processing time varies in each reproduction method. Therefore, by preparing a table in which the value of x can be changed according to the position of the spare area on the optical disc 101, the reproduction processing time can be further shortened. This table is also stored in advance in a ROM or the like accessed by the CPU 111.

As described above, by changing the sector reading order and the data processing method in the data reproduction depending on the number of alternative processes, it is possible to realize a higher speed optical disk device for double-sided reproduction.

[0059]

As is apparent from the above description, according to the optical disk device and the recording / reproducing method of the present invention, when the defective sector is recorded in an alternative manner on an optical disk capable of double-sided recording, the data is reproduced. It is possible to shorten the reading processing time in.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an optical disk device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of a double-sided optical head according to the first embodiment of the invention.

FIG. 3 is a schematic diagram showing a spiral shape of a double-sided optical disk according to Example 1 of the present invention.

FIG. 4 is a flowchart showing a flow of an alternative process in a recording operation at the time of double-sided simultaneous recording according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a circuit configuration of an optical disk device according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a circuit configuration of a reproduction system of an optical disc device according to a third embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between the number of alternative processes and the reproduction process time of the optical disk device of the present invention.

FIG. 8 is a schematic diagram of a format showing a replacement area of an optical disc according to a conventional example.

[Explanation of symbols]

 101 Optical Disc 102 Optical Head A 103 Optical Head B 104 Laser Power Control Circuit A 105 Laser Power Control Circuit B 106 Servo Driver 107 Servo Controller 108 Sector Format Controller 109 RAM 110 Error Correction Circuit 111 CPU 112 Drive Controller 113 Pickup A 114 Pickup B 115 Preamplifier A 116 Preamplifier B 117 Analog signal processing circuit A 118 Analog signal processing circuit B

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 20/18 512 D 9074-5D 552 A 9074-5D 9074-5D G11B 20/18 572 F (72) ) Inventor Motoshi Ito 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] 1. An optical disk device using an optical disk having two simultaneously recordable surfaces, both of which have spare areas for alternative recording, wherein a series of data to be recorded is recorded on the two surfaces. Means for distributing the first data to be recorded on the first surface of the first surface and the second data to be recorded on the second surface of the two surfaces, and recording and reproducing the first data to and from the first surface First recording / reproducing means for recording, second recording / reproducing means for recording / reproducing the second data on / from the second surface, and any one of the two surfaces during simultaneous recording of the two surfaces. Detecting means for detecting the non-recordable defective sector that has occurred, recording data of the detected defective sector, and 2
The recording data of the corresponding sector corresponding to the defective sector of the surface which is not the surface having the defective sector is subjected to the alternative recording process in the alternate sector of the spare area of each of the two surfaces, and the defect is recorded. Control means for controlling the first recording / reproducing means and the second recording / reproducing means so as to record defect information regarding a sector in a predetermined area of the optical disc, and the first recording / reproducing means reproduces the first information. Integrating the data and the second data reproduced by the second recording / reproducing means,
An optical disk device comprising: a data integration unit that arranges the data into the series of data. 2. The optical disk device according to claim 1, wherein each time the detecting unit detects a defective sector, the control unit performs the alternative recording of the defective sector and the corresponding sector corresponding to the defective sector. 3. The defective sector of the recording data to the defective sector generated for the recording of the series of data, and the defective sector of the surface other than the surface having the defective sector of the two surfaces. A first storage unit for temporarily storing the recording data in the sector corresponding to the above, and controlling the recording data stored in the first storing unit to collectively perform the alternative recording process for the series of data. Item 1. The optical disk device according to item 1. 4. The optical disk device according to claim 1, wherein the data integrating means successively integrates and arranges the reproduced first data and the reproduced second data. 5. The data integration means comprises second storage means for temporarily storing the data read from the optical disk, and the data stored in the second storage means and the data read from the optical disk. 2. The optical disk device according to claim 1, wherein data that is not stored in the second storage unit is integrated and arranged. 6. The data integration means comprises second storage means for temporarily storing the data read from the optical disc, and the reproduced first data and the reproduced second data are successively integrated and arranged. It has a first function and a second function of integrating and arranging the data stored in the second storage means and the data read out from the optical disk and not stored in the second storage means. A means for reading the defect information recorded from the predetermined area and detecting an alternative processing amount; and a first function and a second function of the data integrating means according to the detected alternative processing amount. The optical disc device according to claim 1, further comprising: 7. The optical disk apparatus according to claim 1, further comprising means for moving the first recording / reproducing means and the second recording / reproducing means with respect to the optical disk. 8. The optical disk device according to claim 7, further comprising means for independently performing focus control and tracking control on the two surfaces of the optical disk. 9. The optical disk apparatus according to claim 1, wherein the control means controls the defect information to be recorded on the two surfaces at the same position in the radial direction and the tangential direction of the optical disk. 10. The detection means includes third storage means for temporarily storing data to be recorded on the optical disc,
The optical disk device according to claim 1, wherein the defective sector is detected by reproducing the data recorded on the optical disk and comparing the reproduced data with the data stored in the third storage means. 11. Defect management of the optical disc when recording and reproducing a series of data on an optical disc having two surfaces capable of simultaneous recording and having spare areas for alternate recording on both of the two surfaces. The recording step comprises: a first data recorded on a first surface of the two surfaces; and a second data recorded on a second surface of the two surfaces. Distributing to the first surface, recording the first data on the first surface, and
Simultaneously recording the second data on a surface, detecting unrecordable defective sectors generated on any one of the two surfaces during simultaneous recording on the two surfaces, The recorded data of the defective sector, and 2
Performing a substitute recording process on the recording data of a corresponding sector corresponding to the defective sector on a surface that is not the surface having the defective sector among the surfaces, to the alternate sector of the spare area on each of the two surfaces; Recording defect information about a defective sector in a predetermined area of the optical disc, the reproducing step reproducing the first data from the first surface and reproducing the second data from the second surface. And a step of integrating and arranging the reproduced first data and the reproduced second data to form the series of data.