JPH046670A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To make it possible to continuously record/reproduce data over two zones and to effectively use the recording area of a recording medium by arranging an information recording area other than a user data area on a boundary part between two zones. CONSTITUTION:Zones Z0 to Z5 are divided into user sector areas 12 and replacing sector areas 13, and when a defective sector is generated in a certain user sector area 12, replacing processing for replacing the defective sector by a substitutive sector in the replacing sector area of the same zone is executed. The replacing sector area 13 in each zone is arranged on the boundary side of the zone. When recording/reproducing frequency is switched in each zone, an MPU 4 discriminates the zone to which a head is moved based on a reproducing signal outputted form a disk R/W part and supplies a prescribed recording/ reproducing frequency control signal to the disk R/W part 10 to switch the frequency. Consequently, the recording/reproducing processing over the two zones can be continuously executed and the recording area of the medium can be also effectively used.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is an information recording method using the MCAV method, which divides the recording area of a disk recording medium into a plurality of zones and switches the recording/reproducing frequency or the rotational speed of the medium for each zone. Regarding a playback device.

[Prior Art] Conventionally, magnetic disks, optical disks, and the like have been known as disk-type information recording media having a configuration in which a spiral track is divided into a plurality of sectors. Among these, optical discs have a high error rate when recording information, so an error correction code (ECC) is added to the data.
The reliability of the data is increased by adding the ecting code). Also, after recording the data,
By reproducing the data in this sector and verifying whether it was recorded normally, if there is an error, you can record it again in the same sector or record data in another alternative sector to detect the defect. Sector relief is underway. Therefore, in optical discs, it is common to reserve a sector area in advance to replace the defective sector.

In addition, in such an information recording and reproducing apparatus, there are two methods for recording data on an optical disk: a CAV method in which recording bits are formed on a track at a constant angular velocity, and a CLV method in which recording bits are formed at a constant linear velocity. Since the CAV method performs recording at a constant angular velocity, the recording density on the outer circumferential side of the disk is lower than that on the inner circumferential portion, and is inferior to the CLV method in terms of efficient use of recording capacity.

On the other hand, the CLV method has the disadvantage that the sectors are not radial and the rotation speed varies depending on the recording position, so data cannot be reproduced until the rotation speed reaches the target value at the time of access, resulting in a long access time. .

Therefore, for example, in Japanese Patent Application Laid-Open No. 59-167874, MCAV is a method that combines the easy access of the CAV method and the superior recording density of the CLV method.
A method has been proposed. In other words, this MCAV method divides the disk in the radial direction into multiple zones,
By lowering the number of rotations toward the outer circumference, the recording density is reduced toward the outer circumference, thereby improving the disadvantage of the CAV method, in which the recording density becomes lower toward the outer circumference. Furthermore, as a similar MCAV method, there is also known a method in which the rotational speeds on the inner and outer circumferences are kept constant, and recording is performed by increasing the recording/reproducing frequency toward the outer circumference.

[Problem to be Solved by the Invention j] However, in such an MCAV system device, when recording and reproducing, the number of rotations of the disk and the recording/reproducing frequency differ when moving to the next zone. Therefore, at the boundary between zones, recording and reproducing operations cannot be performed until the rotational speed of the disk and the recording and reproducing frequency are switched, and recording and reproducing cannot be performed continuously between the two zones. Furthermore, if continuous processing is attempted, it is necessary to provide an unrecordable area at the zone boundary, resulting in a problem that the usage efficiency of the medium decreases.

The present invention was made to solve these problems, and its purpose is to enable continuous recording and playback processing in two zones, and to use the recording area of the medium without wasting it. An object of the present invention is to provide an information recording and reproducing device.

[Means for solving the problem] In order to achieve the above object, a disk recording medium is divided into a plurality of zones in the radial direction, and recording and reproduction are performed by switching the recording/reproducing frequency or the rotational speed of the recording medium for each zone. In the information recording and reproducing apparatus, an information recording area for recording predetermined information other than the user data area is arranged in one or both of the boundary parts of each of the divided zones adjacent to other zones, There is provided an information recording/reproducing apparatus characterized in that the recording/reproducing frequency or the rotational speed of the recording medium is switched in this area.

[Operation] According to the present invention, by arranging the information recording area other than the user data area at the boundary between the zones divided in the radial direction, recording and playback can be performed continuously over the two zones, and the recording The recording area of the medium is also wasted (it was meant to be used).

[Examples] Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the information recording/reproducing apparatus of the present invention.

In FIG. 1, l is an information recording/reproducing device connected to a host computer 2, which is a higher-level control device. The information recording and reproducing apparatus 1 uses an optical disc (not shown) as a recording medium, and performs recording and reproducing operations according to instructions from the host computer 2.

The host I/F control unit 3 transmits and receives commands and data to and from the host computer 2, and receives commands such as read/write, recorded data, and transmits reproduced data. M.P.L.
I4 controls the operation of the entire device, and controls each part in the device according to a control program stored in ROM5. In addition, RAM6 is a work memory for MPU4, EC
The C circuit 7 is a circuit that performs modulation and demodulation for adding or deleting ECC to data, and performs a verify check, and the ECCRAM 8 is a work memory for the ECC circuit 7. The read/write buffer 9 is a buffer memory that temporarily stores recorded data sent from the host computer 2 and playback data sent to the host computer 2. The disk R/W section 10 is controlled by the disk control section 11. This is a recording/reproducing unit that records or reproduces data on an optical disc.

In the information recording/reproducing apparatus of this embodiment, the above two MCs
In the AV system, the recording area of an optical disc is divided in the radial direction to form multiple annular zones, and the recording/playback frequency is increased from the inner zone to the outer zone. The MCAV method is adopted.
In this MCAV system, when switching the recording/reproducing frequency for each zone, the MPU 4 identifies which zone the head will move to based on the reproduction signal from the disk R/W section 1O. Then, frequency switching is performed by supplying a predetermined recording/reproducing frequency control signal to the disc R/W section 10 according to the identification result.

The read/write buffer 9 also controls the transfer speed of read/write data to the host computer 2 and the recording/writing speed of the optical disc in the disc R/W unit 10.
It is provided for temporary storage of data due to the difference in playback speed and data modulation/demodulation processing in the ECC circuit 7.

FIG. 2 is a plan view showing the structure of the recording area of the optical disc used in this embodiment.

The recording area of this optical disc is 6 from the inner circumference to the outer circumference.
It is divided into four zones ZO to Z5. The number of sectors for one track in each zone 20-25 is 11 in the innermost zone ZO, increases by one toward the outer circumference, and reaches 16 in the outermost zone Z5. .

FIG. 3 is an enlarged explanatory diagram of the zone boundaries of the optical disc shown in FIG. 2. In the figure, A n -s to A.

is the last sector of zone A, B1 to B4 are the first sectors of zone B, and data is recorded and reproduced from zone A to zone B. When switching the recording/reproducing frequency, the optical disc rotates through two to three sectors during the switching time. Therefore, in this example, when shifting from zone A to zone B, MPU 4 outputs a frequency switching command to disk R/W section 0 at time T when the ID of sector A, , is detected. Then, at time T2, the stable recording and reproducing frequency of zone B is reached, and recording and reproducing are performed at the frequency switched from the first sector B of zone B. In addition, the last three sectors A of zone A. -2, A n-1, An cannot be recorded or played back because the recording/playback frequency is switched, but since the recording and playback processing for this area has already been completed as described later, no problem will occur. .

Next, the optical disc used in this embodiment will be explained. FIG. 4 is an explanatory diagram schematically showing the logical format of an MCAV type optical disc.

Note that zones zO to Z5 shown in FIG. 4 correspond to zones 20-25 shown in FIG. 2. First, each zone is divided into a user sector area 12 and a spare sector area 13.

Then, when a defective sector occurs in the user sector area 12, a replacement process is performed in which the defective sector is replaced with a replacement sector in the replacement sector area 13 in the same zone. Further, the replacement sector areas 13 of each zone are provided on the boundary side of each zone.

FIGS. 5 and 6 show the processing flow of this embodiment. first,
As shown in FIG. 3, processing when recording and reproducing is transferred from zone A to zone B will be described. In FIG. 5, sector A of zone A is the beginning of the zone switching area for switching the zone frequency in S (step) l.

-2, and the disk R/W unit 10 detects the ID of that sector. The ID includes address information of the sector, and upon receiving this address information, the MPU 4 instructs the disk control unit 11 to switch to the recording/reproducing frequency of zone B. As a result, in S2, the disk control section 11 starts switching the recording/reproducing frequency, and switches to the frequency of the next zone immediately before zone B shown in FIG. Therefore, in S3, reproduction is performed at the frequency switched from the first sector B1 of the next zone B. Note that the recording operation also involves frequency switching in the same manner as the above-mentioned reproduction.

Furthermore, the reproduction process of the spare sector area shown in FIG. 4 will be explained. In FIG. 6, if there is a sector that has been replaced during playback of the user sector area 12 in Sl, the replacement sector in the replacement sector area 13 in the same zone is accessed. Next, the data of the replacement sector accessed in S2 is read. When reading a replacement sector, there is no need to switch frequencies since the processing is performed within the same zone. Note that recording to a replacement sector can also be performed by a similar operation. Furthermore, since access to the spare sector occurs during recording and reproduction of user sectors in the same zone, there is no continuous access from the spare sector area of zone A to the first user sector area of zone B.

Another example of the optical disc is shown in FIG. In this example, the spare sector area 13 is arranged at the beginning of the zone. When using an optical disc of this format, the recording/reproducing frequency is switched at the beginning of the zone. Further, FIG. 8 shows still another example of an optical disc. The optical disc of this example is a combination of the optical discs of FIGS. 4 and 7, and is an example in which alternate sector areas 13 are provided at the beginning and end of the zone. Therefore, when using this optical disc, the recording/reproducing frequency may be switched at either the beginning or the end of the zone.

In the above embodiments, an MCVA type information recording and reproducing apparatus that switches the recording and reproducing frequency for each zone has been described, but it is of course also applicable to an information recording and reproducing apparatus that switches the rotational speed of the optical disc for each zone. in this case,
Instead of the recording/reproducing frequency, the rotational speed of the optical disk may be changed in the same manner as in the above-described embodiment. Further, the area arranged at the boundary between zones may be a replacement management information area or a zone information area in which the recording/reproducing frequency of the zone, the capacity of the zone, the number of tracks, etc. are recorded.

[Effects of the Invention] As described above, according to the present invention, recording and reproduction processing can be performed continuously over two zones, and efficient processing can be performed. Further, by arranging an area other than the user data area, such as a spare sector area, as the area at the boundary of the zone, the recording area of the recording medium can be used without wasting it. Therefore, it is possible to provide an information recording and reproducing apparatus that can efficiently perform recording and reproducing processing while also making efficient use of the recording area of the medium.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an information recording/reproducing apparatus of the present invention, FIG. 2 is a schematic plan view showing a state of zone division of a disk recording medium used in the present invention, and FIG. An explanatory diagram showing the switching timing of the recording/reproducing frequency at the boundary. Figure 4 is an enlarged view of the disc recording medium in Figure 2, and a configuration diagram showing the main part configuration of the disc recording medium. Figure 5 is the same as Figure 1. FIG. 6 is a flowchart showing the switching operation of the recording/reproducing frequency in this embodiment, FIG. 6 is a flowchart showing the reproducing operation of a replacement sector, and FIGS. 7 and 8 are configuration diagrams showing other examples of the disk recording medium. 1; Information recording and reproducing device 2; Host computer 10: Disk R/W section; 12; User sector areas ZO to Z5. zone.

Claims (2)

[Claims] (1) In an information recording and reproducing apparatus that divides a disk recording medium into a plurality of zones in the radial direction and performs recording and reproduction by switching the recording and reproducing frequency or the rotational speed of the recording medium for each zone, each of the divided zones an information recording area for recording predetermined information other than the user data area is arranged in one or both of the boundary areas adjacent to other zones;
An information recording/reproducing apparatus characterized in that the recording/reproducing frequency or the rotational speed of the recording medium is switched in this area. (2) The information recording and reproducing apparatus according to claim 1, wherein the information recording area of the predetermined information is a spare sector area or a spare management information area.