JPH0287370A - Method for managing defect of optical disk - Google Patents

Abstract

PURPOSE:To attain high speed processing by generating a list of an alternate sector decided to be defective by verification, recording it onto an optical disk, referencing the list prior to the recording to an alternate sector so as not to use the defective alternate sector in the list for the alternate recording. CONSTITUTION:The list of a defective alternate sector 3 is generated and recorded on an optical disk and when the necessity of alternation of the sector is caused, the list is referenced not to use a defect list. That is, when any defective sector exists in the alternate sectors, it is recorded on a prescribed area of the optical disk. The recording is read in advance when the optical disk is loaded and when the recording to the alternate sector is required, it is referenced and the recording is applied to other alternate sector not registered in the alternate map 2 while avoiding the defective alternate sector 3. Thus, the processing of recording/reproduction/verification to the defective alternate sector 3 is excluded and the alternate processing is quickened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for re-recording data caused by a defect in a write-once optical disk or a magneto-optical disk (hereinafter collectively referred to as an optical disk), so-called defect management ( Defect management) methods.

[Conventional technology]

Data is recorded on a recordable optical disc as follows. As shown in FIG. 4, the optical disc has a plurality of tracks T in the radial direction, is divided into a plurality of sectors S in the circumferential direction, and is managed, and data is recorded and reproduced in units of sectors.

When data is recorded, it is reproduced immediately after recording to verify the recorded data, and if the recording is not performed correctly to the extent that it can be compensated for, it is recorded in a pre-prepared replacement sector.

Next, a method of using the replacement sector will be explained based on FIG.

As shown in this figure, a plurality of tracks are grouped into one group, and a plurality of primary spare sectors FAS are prepared for each group. If there is a defect in the recorded data that exceeds a predetermined standard as a result of recording, playback, and verification, it is recorded in the empty area of the primary spare sector FAS prepared for the group of the sector where the recording was performed, and the same verification is performed. I do. The presence or absence of an empty area can be determined by checking the replacement map described later. If there is a defect again, recording is performed in another primary replacement sector FAS.

A predetermined track of the optical disc is provided with a secondary spare sector SAS that is shared by all groups, and a primary spare sector SAS of the group to which the recording target sector belongs is provided.
If all of the sectors are used and there is no room for re-recording, recording is performed using sectors in this secondary spare sector SAS.

The recording to the secondary spare sector SAS is also played back.

Verification is performed, and if there is a defect, it is recorded in another sector. Defective sectors are erased on both the primary and secondary sectors.

The usage status of the primary spare sector FAS and the secondary spare sector SAS is recorded in a spare map AM provided on a predetermined track.

When reproducing data, when a reproduction command signal is given to the optical disk drive device from the outside, the physical address (track number, sector number) representing the area to be reproduced is calculated based on the signal, and this is used to create a replacement map AM. Check the contents of the sector, and as a result, calculate if sector replacement (in addition to writing to the original sector, recording to the primary replacement sector FAS and secondary replacement sector SAS) has not been performed. The data is reproduced by accessing the correct address, and if replacement is being performed, accessing the replacement sector and reproducing data.

Note that the contents of the replacement map AM are read into a memory provided in the drive device when the optical disc is loaded into the drive device, and the presence or absence of sector replacement is checked using the data in this memory.

Next, to explain the case of rewriting (override), when a command signal is given from the outside, the physical address representing the area to be rewritten is first calculated based on it, and the replacement map AM determines whether or not the address has been replaced. The content of is checked by the memory being read. If there is no replacement, the calculated address is accessed and recorded, and the same playback 1 verification as described above is performed. Also, recording is performed in a replacement sector based on the verification result.

If there is a replacement, the calculated address is recorded, reproduced, and verified, and then the replacement sector is accessed, and recording, reproduction, and verification are performed in this area as well.

This is because if old data is left without being rewritten in this replacement sector, inconvenience will occur when it is played back.

Unlike the above methods, there is also a method that does not provide a secondary spare sector SAS. In this method, a relatively large number of spare sectors are provided for each group, and when there is no room for recording in the spare sector of the own group, spare sectors of other groups determined in advance, such as neighboring groups, are used. It is a method. In this case, the replacement map is also recorded on the optical disc and can be played back.

Rewriting is performed in the same manner as before.

Both of the above two methods are defect management methods called map methods, and are characterized in that information regarding replaced sectors is provided as a map. Apart from these methods, there is a method called a pointer method. This is because the track address and sector address (referred to as a forward pointer) of a replacement sector are recorded in advance in a sector of the original recording area for processing when there is a defect in the recording belonging to that sector, and the replacement sector is also recorded in the replacement sector. The track address and sector address (referred to as a backward pointer) of the original sector are recorded in advance. Note that the forward pointer indicates the area expected as the destination replacement sector or the beginning thereof, and can also be used in cases where multiple sectors need to be replaced when recording multiple sectors simultaneously. .

In such a system, information about the replacement sector or the original sector can be obtained using a forward pointer or a backward pointer.

[Problem to be solved by the invention]

In the conventional system as described above, a defective replacement sector is not registered in the replacement map, so a replacement sector that is found to be defective after verification may be reused. Although it depends on the cause, such a replacement sector is generally determined to be defective again and is often replaced with another replacement sector.

Naturally, therefore, recording, reproducing, and verifying the defective replacement sector are wasted.

An object of the present invention is to provide an optical disc defect management method that enables high-speed processing by eliminating such waste.

[Means to solve the problem]

The optical disc defect management method according to the present invention includes creating a list of defective replacement sectors and recording it on the optical disc;
The present invention is characterized in that when it becomes necessary to replace a sector, this list is referred to and the defective list is not used.

[Effect]

If there is a defective sector in the replacement sector, it is recorded in a predetermined area of the optical disc. This record is read in advance when loading an optical disk, and when it becomes necessary to record to a replacement sector, it is referred to and recorded to other replacement sectors that are not registered in the replacement map, avoiding the defective replacement sector. I do.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a block diagram showing the configuration of essential parts of an optical disk drive device for implementing the present invention. Reflected light from an optical disk (not shown) is captured by a reproduction signal detection section 1, where processing such as waveform shaping 5 and error correction is performed, and a reproduction signal is provided to a required section.

As shown in FIG. 2, the optical disc is different from the conventional one shown in FIG. 5 in that a defective replacement sector recording area DAR is provided. When this optical disc is loaded into a drive device, the contents of the defective spare sector recording area DAR are read into the bad spare sector memory 3. Also, replacement map A
The contents of M are read into the alternate map memory 2.

FIG. 2 is a flowchart showing the processing procedure of the write control section 4 during recording. When the write control unit 4 receives the command from the outside, it calculates a physical address (track address, sector address) on the optical disc from information regarding the recording sector included in the command signal, and records it there (step #1). Then, the recorded information is immediately reproduced and verified (#2). If it is determined that the recorded sector is not defective as a result of the verification, the process ends. If it is determined to be defective, please refer to replacement map memory 213)
, then find out which replacement sector should be used. Once the replacement sector is determined, refer to defective replacement sector memory 3 (#4).
Check whether the replacement sector is on the list (#5
), if it is a bad sector, return to step #3,
Similar processing is repeated to find the next replacement sector.

If it is not a defective sector, it is recorded (116), then reproduced and verified (#7), and if the replacement sector is not defective, the process ends. If it is a bad sector, it is added to the bad replacement sector memory 3 and also written to the bad replacement sector recording area DAR. Then, the process returns to step 113. Note that the recording of the defective replacement sector is erased.

By performing the above processing, you can avoid the wasteful process of recording in a sector that is known to be a bad sector, playing it back, verifying it, knowing that it is a bad sector, and recording in another replacement sector. It can be avoided.

Furthermore, since the record of the defective replacement sector is updated in the memory 3, no inconvenience will occur, and since the area DAR of the optical disk is also updated, the defective replacement sector can be excluded and used the next time it is loaded.

Other processes for rewriting and reproducing are performed in the same manner as in the conventional art with reference to the spare map reserve or the contents of the spare map memory 2.

〔Effect of the invention〕

Since the present invention is implemented as described above, the processing of recording, reproducing, and verifying the defective replacement sector is excluded, and the replacement processing speed can be increased accordingly.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus used to implement the method of the present invention, FIG. 2 is a recording format diagram of an optical disc according to the present invention, and FIG. 3 is a flowchart showing the processing procedure during recording.
Figure 4 is an explanatory diagram of the tracks and sectors of an optical disc, Figure 5
The figure is a recording format diagram of a conventional optical disc. 2...Replacement map memory 3...Bad replacement sector 4
. . . Write control unit DAR . . . Defective replacement sector recording area In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A defect management method for an optical disc in which data recorded in a sector is reproduced and verified, and if the data is found to be defective, it is recorded in a replacement sector, and the data is reproduced and verified, further comprising the steps of: An optical disc characterized in that a list of replacement sectors determined to be defective is created and recorded on the optical disc, the list is referred to before recording to the replacement sectors, and the bad replacement sectors in the list are not used for replacement recording. Defect management methods.