JPH025265A - Alternation processing system for optical disk device capable of erasion and rerecording - Google Patents

Abstract

PURPOSE:To surely reproduce the information recorded in the secondary alternation area by recording the dummy data in the case the final sector of a primary alternation area is erased. CONSTITUTION:In the case the erased undesired sector is equal to the final sector of a primary alternation area, a primary alternation area final sector detecting circuit 5 detects the final sector. Then the prescribed dummy data produced by a dummy block generating circuit 6 is written into the final sector. Thus it is possible to retrieve the secondary alternation area by detecting the dummy data recorded in the final sector of the primary alternation area even though the detection of the corresponding information is impossible through the retrieval of the primary alternation area after detection of a defective sector at reproduction of the information. As a result, the information written into the secondary alternation area is surely reproduced.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figures 4 and 5) Means for solving the problem to be solved by the invention (Figure 1) Working examples (Figures 2 and 3) Effects of the invention [Summary] Regarding the replacement processing method in an erasable/rewritable optical disk device, by recording dummy data when the final sector of the primary replacement area is erased, the second To detect whether the sector to be erased is the final sector of the primary replacement area in an erasable/rewritable optical disk device equipped with a read section and a write section, with the aim of reliably searching for the next replacement area. - Equipped with a next replacement area final sector detection means and a dummy block generation means for generating dummy data, and when the erased sector is the final sector of the primary replacement area, dummy data is recorded in the final sector. .

[Industrial application field]

The present invention relates to an erasable/re-recordable optical disc device, and more particularly to a replacement processing method for an erasable/re-recordable optical disc device that has a replacement sector for a defective sector.

[Conventional technology]

In a re-recordable optical disk device, information is stored in units called sectors, and after the information is recorded, the recorded information is reproduced, and recording is normally completed when the information can be read normally. However, due to defects in the medium, etc., it may not be possible to read the data correctly after recording.
At this time, sectors that cannot be correctly recorded are detected as defective sectors, and are sequentially rewritten in replacement sectors (referred to as -next replacement sectors) in a predetermined replacement area.

FIG. 4 schematically shows a conventional optical disc having such a replacement area for replacement sectors.

In the figure, reference numeral 51 denotes an optical disk, which has a large number of concentric tracks, and these tracks are divided into, for example, eight sectors from θ to 7, as shown in the figure. Optical disks have a higher track density than magnetic disks, and are therefore more prone to defects.

As described above, an optical disk stores information in units called sectors, and if there is a defective sector, a replacement sector is provided and information is stored in the replacement sector. In addition to the primary replacement area in which the primary replacement sector is provided, the replacement sector is provided with a secondary replacement area, which is used when the secondary replacement area is insufficient.

A primary replacement area is usually provided for each track.
For example, as shown in FIG. 4, six sectors 0 to 5 are used as normal storage areas, and two sectors 6 to 7 are used as primary alternate areas. A secondary replacement area is provided in area 52, which is a spare track. Of course, the number of sectors is not limited to this example.

For efficient use of optical discs, it is better to have as little space as possible for alternate sectors, and for discs with many defects, it is better to have more, but this is determined by taking into account the incidence of defects on the disc. be done.

If a defective sector is discovered during information recording, a sector in the primary replacement area is first used in place of the defective sector, but if this secondary replacement area is completely used,
This time, it will be stored in a secondary alternate area provided in a spare trunk or the like. When reproducing information, when a defective sector is detected, a search for the next replacement area is sequentially performed. - If there is no corresponding sector in the next replacement area, - confirm that information is recorded in the last sector of the next replacement area, and determine that the information corresponding to the secondary replacement area is recorded;
The secondary replacement area is searched, the corresponding sector is detected, and the information is transferred to the higher-level device.

- The reason why the secondary replacement area is searched after confirming that information is stored in the last sector of the next replacement area is as follows.

- The next replacement area is provided for each track, and when a defective sector is detected, a replacement sector for this defective sector can be provided in the replacement area of the same track.

Therefore, even if all the -next replacement areas are searched, there is no particular effect on the overall access time.On the other hand, the secondary replacement area is provided in a spare track, and is used to search defective sectors and -next replacement areas. This is a different track from the track with the replacement sector. Therefore, in order to search for the secondary alternation area, it is necessary to move the head, which increases the access time. If the entire secondary replacement area is always searched even if the last sector of the -next replacement area is unrecorded, the secondary replacement area will be searched even if the secondary replacement area is not re-recorded, and it will take a long time. There will be a lot of waste. In other words, it is preferable not to access the secondary substitution area except when necessary, and as a means of determining whether access to the secondary substitution area is necessary, - It is confirmed whether the final sector of the replacement area has been recorded or not.

As a result, the optical disc can be used efficiently and in a minimum amount of time.

[Problem to be solved by the invention]

However, according to the method described above, since unnecessary information can be erased in an optical disk device that is capable of erasing and re-recording, a malfunction may occur if the last sector of the next replacement area is erased. There are cases. For example, even if a defective sector is detected during playback and the corresponding sector is in the secondary replacement area, the last sector in the -next replacement area will be erased and become unrecorded, so it will not be rewritten in the secondary replacement area. However, there is a problem in that an error occurs because it is determined that there is no corresponding sector and the secondary replacement area is not searched.

External storage devices such as optical disk devices are used to store information (various data) that the user wants to keep. The storage capacity of a storage device is finite, and if a user records information one after another, the storage area will eventually be used up.

For reasons such as making effective use of storage space, users request to erase information that is no longer needed on storage devices that allow erasing and re-recording. The user constantly records necessary information and erases unnecessary information.

As a result, when using an erasable and rewritable optical disk as a storage device, even if a sector is allocated -degrees, the information in that sector becomes unnecessary for the user, and if the user requests deletion, the sector allocated -degrees becomes unnecessary for the user. Even if it is, it will be erased, resulting in the problem described above.

FIG. 5 is an operational flow diagram of such a conventional example.

Now, suppose that the final sector of the -next replacement area has been erased (step l) for the reason mentioned above, and if a defective sector is subsequently detected (step 2), the -next replacement area must first be searched. Step 3) Check whether the relevant sector exists (Step 4). If the sector is detected at this time, read the sector and send the information to the host device (
Step 7) and ends normally (Step 8). If the sector in question is not detected, the recording status of the final sector in the -next replacement area is checked, but in this case, since the last sector in the primary replacement area has been erased, access to the secondary replacement area is not possible. Therefore, the process ends abnormally without detecting the corresponding sector (step 6).

The present invention has been made in view of these points,
It is an object of the present invention to provide a replacement processing method in an erasable/rewritable optical disk device that can search a secondary replacement area only when necessary and shorten the time required for access.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, reference numeral 1 denotes an optical disc control unit, which is composed of, for example, a microprocessor (MPU), and controls the entire optical disc.

Reference numeral 2 denotes an optical disk drive circuit, 3 a read section, and 4 a write section.Furthermore, according to the present invention, a primary replacement area final sector detection circuit detects whether an erased sector is the final sector of the primary replacement area. 5. - A dummy block generation circuit 6 is provided which is dummy data to be re-recorded in the final sector of the next replacement area when it is erased.

[Effect]

While using an optical disc device, a user erases sectors that are no longer needed in order to use the optical disc device efficiently. At this time,
If the erased sector is the final sector of the primary replacement area, the -next replacement area final sector detection circuit 5 detects this,
A predetermined dummy block (dummy data) generated by the dummy block generation circuit 6 is written into the final sector.

According to this, when reproducing information, defective sectors are detected and
- Even if the corresponding information cannot be detected when searching the next replacement area, dummy data is recorded in the last sector of the next replacement area, so by detecting this dummy data, you can be sure that the second replacement area will be searched. It becomes possible to perform a search, and the information written in the secondary replacement area can be reliably reproduced.

〔Example〕

FIG. 2 shows an embodiment of this invention. This example is
The principle is basically the same as the principle diagram in FIG. 1, and the read unit 3 reads the defective sector mark detection circuit 31 and the 10 portions at the beginning of the sector! The write section 4 is composed of a D section sled circuit 32, and a data block read circuit 33 that reads the data area (following the ID section). It is composed of a block erase circuit 43.

Information from the host device is first recorded sector by sector by the data block write circuit 42 under the control of the optical disc control section 1. After recording the information in this way,
This information is reproduced by the read section, and when the information is read normally, it is assumed that the recording was performed normally and has ended normally.

If the recording cannot be read normally, this sector is detected as a defective sector, and the information is recorded in a replacement sector in a predetermined primary replacement area. record defective sector marks.

In this way, information is recorded sequentially, and when the primary replacement area for defective sectors is full and more defective sectors occur, the information is then recorded on another spare track. This will be recorded in the secondary substitution area.

In order to effectively use this optical disc, the user repeatedly records necessary information and erases unnecessary information. Data is erased by the data block erase circuit 43 after reading and confirming the sector to be erased. At this time, according to the present invention, the -next replacement area final sector detection circuit 5 detects whether the sector to be erased is the final sector of the primary replacement area. If the sector to be erased is the final sector of the primary replacement area, dummy data from the dummy block generation circuit 6 is recorded in this final sector. (Dummy data is a block that can be recognized during playback by writing special data to identify the dummy block in the data section.) When playing back information, detect defective sectors. Then, first, the -next replacement area is searched, and if there is no corresponding information in this -next replacement area, it is recognized that the information is recorded in the last sector of this -next replacement area, and the secondary replacement area is searched. It is determined that information corresponding to the substitution area is recorded, and a search for a secondary substitution area is started. When the relevant information is changed,
Transfer this to the higher-level device.

FIG. 3 is an operation flow diagram for explaining this operation.

As explained above, when erasing the final sector of the -next replacement area, a dummy block is always stored in this final sector (steps 1 and 2). If a defective sector is detected in this state, the -next replacement area is searched (step 3, step 4), and if the corresponding information is searched here, it is transferred to the host device and the process ends normally (step 11, step 12).

If the corresponding sector is not detected, it is checked whether there is a record in the last sector of the -next replacement area, and if there is a record, the secondary replacement area is searched (steps 6 and 7). In this invention, dummy data is recorded in the final sector of the next replacement area whenever recorded data is erased.
When this next replacement area is full and there is data in the secondary replacement area, there will always be some kind of record in the last sector of this next replacement area.

Therefore, unless there is some kind of malfunction, step 8~
10, and the process ends normally.

In the above explanation, an example was explained in which the primary alternation area is provided in the same trunk in concentric tracks, but the same applies of course to cases where the track is spiral (spiral shape) or where the -second alternation area is provided on a separate track. be. Further, the number of sectors is not limited to the number exemplified above, and can be selected as appropriate.

〔Effect of the invention〕

As described above, according to the present invention, in an optical disk device capable of erasing and re-recording, even if the final sector of the secondary replacement area is erased, information recorded in the secondary replacement area can be reliably reproduced. Therefore, it is possible to obtain an optical disc device with short access time to information and high reliability.

FIG. 4 is a configuration diagram of an optical disc, and FIG. 5 is an operation flow diagram for explaining conventional optical disc replacement processing.

- Optical disc control section, -- Optical disc drive circuit, ... Read section, 4- Write section, ...
-Next replacement area final sector detection circuit, .--dummy block generation circuit.

Claims (1)

[Claims] (1) In an erasable/rewritable optical disk device comprising a read section and a write section, a primary replacement area final sector detection means (5) for detecting whether or not the sector to be erased is the final sector of the primary replacement area; Dummy block generation means (6) for generating dummy data
A replacement processing method in an erasable/rewritable optical disk device, comprising: recording dummy data in the final sector of the primary replacement area when the erased sector is the final sector of the primary replacement area.