JPH07118153B2 - Alternation processing method for erasable / rewritable optical disk device - Google Patents

Description

DETAILED DESCRIPTION [Table of Contents] Outline Industrial field of application Conventional technology (Figs. 4 and 5) Problem to be solved by the invention Means for solving the problem (Fig. 1) Operation Example (FIGS. 2 and 3) Effects of the Invention [Overview] Regarding an alternation processing method in an erasable / rerecordable optical disk apparatus, dummy data is recorded when the last sector of the primary alternation area is erased. Detecting whether the sector to be erased is the last sector of the primary replacement area in an erasable / rerecordable optical disk device equipped with a read section and a write section for the purpose of surely searching the next replacement area. When the erased sector is the last sector of the primary alternation area, it is provided with a primary alternation area last sector detection means and a dummy block generation means for generating dummy data. -Record data.

[Industrial application field]

The present invention relates to an erasable / rewritable optical disk device, and more particularly to an erasable / erasable optical disk device having a replacement sector for defective sectors
The present invention relates to a rewritable optical disk apparatus replacement processing method.

[Conventional technology]

In a re-writable optical disk device, information is stored in units of sectors. After recording information, the recorded information is reproduced, and when the information is normally read, the recording is normally completed. However, if there is a case where it cannot be read normally after the recording due to a defective medium,
At this time, a sector that cannot be correctly recorded is detected as a defective sector, and is sequentially re-recorded in a replacement sector (referred to as a primary replacement sector) in a predetermined replacement area.

FIG. 4 shows an outline of a conventional optical disk having such a replacement area for a replacement sector.

In the figure, reference numeral 51 is an optical disc, which has a large number of concentric tracks, and these tracks are divided into, for example, eight sectors 0 to 7, as shown in the figure. Optical discs have a higher track density than magnetic discs, and are therefore prone to defects.

As described above, the optical disc stores information in units of sectors. When there is a defective sector, a replacement sector is provided and information is stored in the replacement sector. The replacement sector is provided with a secondary replacement area which is used when the primary replacement area is insufficient, in addition to the primary replacement area in which the primary replacement sector is provided.

The 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. The secondary alternate area is provided in the area 52 which is a spare track. Of course, the number of sectors is not limited to this example.

The area for alternate sectors should be as small as possible for efficient use of the optical disc, and should be large for discs with many defects, but this is determined in consideration of the incidence of disc defects. To be done.

If a defective sector is found during the recording of information, the sector of the primary alternate area is used first instead of this defective sector, but if all of this primary alternate area is used,
This time, it will be stored in the secondary alternation area provided in the spare track or the like. When reproducing information, when a defective sector is detected, the primary replacement area is sequentially searched. If there is no sector corresponding to the primary replacement area, confirm that the information is recorded in the last sector of the primary 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 host device.

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

The primary alternate area is provided for each track, and when a defective sector is detected, the alternate sector of this defective sector can be provided in the alternate area of the same track.
Therefore, even if all primary replacement areas are searched, there is no particular influence on the total access time. On the other hand, the secondary replacement area is provided in the spare track and is different from the track having the defective sector / primary replacement sector. Therefore, it is necessary to move the head in order to search the secondary alternate area, and the access time becomes long. Even if the last sector of the primary alternation area is unrecorded, if all the secondary alternation areas are always searched, the secondary alternation area will be searched even if it is not re-recorded in the secondary alternation area. Wasteful. In other words, it is preferable not to access the secondary replacement area except when necessary. As a means for determining whether or not access to the secondary replacement area is necessary, the primary replacement area is It is confirmed whether or not the last sector of the area has been recorded.

As a result, the optical disk can be used efficiently in the minimum time.

[Problems to be Solved by the Invention]

However, according to the method described above, in an optical disk device capable of erasing and re-recording, unnecessary information can be erased. Therefore, when the last sector of the primary alternation area is erased, malfunction occurs. There is. For example, even if a defective sector is detected during reproduction and the corresponding sector is in the secondary alternation area, the last sector of the primary alternation area is erased and becomes unrecorded, so it is not re-recorded in the secondary alternation area. However, there is a problem that an error occurs when the secondary replacement area is not searched and there is no corresponding sector.

An external storage device such as an optical disk device is for storing information (various data) that the user wants to leave. The storage capacity of the storage device is finite, and when the user records information one after another, the storage area will be exhausted at the end. The user issues a request for erasing unnecessary information in a erasable / rerecordable storage device for reasons such as effective use of the storage area. Actually, the user does not request the erasing after using the entire storage area, and the user always repeats recording necessary information and erasing unnecessary information.

As a result, when an erasable / re-recordable optical disk is used as a storage device, even if a sector has been assigned once, the information in that sector becomes useless to the user, and if the user requests erasing, the sector will be assigned once. However, it will be erased, resulting in the problems described above.

FIG. 5 is an operation flow chart of such a conventional example.

Now, for the reason described above, if the last sector of the primary replacement area is erased (step 1), and if a defective sector is detected thereafter (step 2), first, the primary replacement area is searched (step 1). 3) It is confirmed whether or not the sector exists (step 4). At this time, if the sector is detected, the sector is read, information is sent to the host device (step 7), and the process ends normally (step 8). When the relevant sector is not detected, the recording state of the last sector of the primary alternate area is checked. In this case, since the last sector of this primary alternate area has been erased, access to the secondary alternate area is not possible. If this is not done, the relevant sector is not detected, and the process ends abnormally (step 6).

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

[Means for Solving the Problems]

 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 is an optical disk drive circuit, 3 is a read section, and 4 is a write section. Further, according to the present invention, a primary replacement area final sector detection circuit for detecting whether or not the erased sector is the last sector of the primary replacement area. 5. When the last sector of the primary alternation area is erased, a dummy block generation circuit 6 which is dummy data to be re-recorded therein is provided.

[Action]

The user erases unnecessary sectors while using the optical disk device for efficient use. At this time,
If the erased sector is the last sector of the primary alternation area, the primary alternation area final sector detection circuit 5 detects this and a predetermined dummy block (dummy data) generated by the dummy block generation circuit 6 is added to the above. Write to the last sector.

According to this, when reproducing information, a defective sector is detected,
Even if the relevant information cannot be detected when searching the primary alternation area, dummy data is recorded in the last sector of the primary alternation area.Therefore, by detecting this dummy data, the secondary alternation area must be searched. The information written in the secondary alternation area can be surely reproduced.

〔Example〕

FIG. 2 shows an embodiment of the present invention. This example
Basically the same as the principle diagram of FIG.
Is the defective sector mark detection circuit 31, at the beginning of the sector
The write section 4 includes an ID section read circuit 32 for reading the ID section and a data block read circuit 33 for reading the data area following the ID section. The write section 4 includes a defective sector mark generation circuit 41, a data block write circuit 42, And a data block erase circuit 43.

Information from the host device is first recorded by the data block write circuit 42 in sector units under the control of the optical disc control unit 1. After the information is recorded in this manner, the information is reproduced by the read unit, and when the information is normally read, it is assumed that the recording has been normally performed, and the recording is normally completed. If the recording could not be read normally, this sector is detected as a defective sector, and the information is recorded in the alternate sector of the predetermined primary alternate area,
The defective sector mark from the defective sector mark generation circuit 41 is recorded in the defective sector.

In this way, the information is sequentially recorded, the primary replacement area for the defective sector is filled up, and when the defective sector is generated, the information is next provided in another spare track. It will be recorded in the secondary replacement area.

The user repeats recording necessary information and erasing unnecessary information in order to effectively use this optical disk. Data is erased by the data block erase circuit 43 after reading the sector to be erased and making sure. At this time, according to the present invention, the primary alternate area final sector detection circuit 5 detects whether the sector to be erased is the final sector in the primary alternate area. When the sector to be erased is the last sector of the primary alternate area, the dummy data from the dummy block generation circuit 6 is recorded in this last sector. (Dummy data is a block in which special data for identifying a dummy block is written in the data section so that the dummy block can be recognized during reproduction.) When reproducing information, a defective sector is detected. Then, first, the primary alternation area is searched, and if there is no corresponding information in this primary alternation area, it is recognized that the information is recorded in the last sector of this primary alternation area, and the secondary alternation area is recognized. It is determined that the corresponding information is recorded, and the search for the secondary replacement area is started. When the corresponding information is obtained, it is transferred to the host device.

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

As described above, when erasing the final sector of the primary alternate area, the dummy block is always stored in this final sector (steps 1 and 2). When a defective sector is detected in this state, the primary replacement area is searched (steps 3 and 4), and when the corresponding information is searched here, this is transferred to the host device and the processing ends normally (step 11). , Step 12).

If the corresponding sector is not detected, it is confirmed whether or not there is a record in the last sector of the primary alternate area, and if there is a record, the secondary alternate area is searched (steps 6 and 7). In the present invention, dummy data is recorded in the last sector of the primary alternate area even when the recorded data is erased.
Whenever the primary alternation area is full and there is data in the secondary alternation area, there will always be some recording in the last sector of this primary alternation area.

Therefore, unless there is any malfunction, steps 8 to
It will work with 10, and will end normally.

In the above description, an example in which the primary alternation areas are provided on the same track in the concentric circular tracks has been described. However, the same applies to the case where the tracks are spiral (spiral) and the primary alternation area is provided on another track. . Further, the number of sectors is not limited to the above-exemplified number, and can be appropriately selected.

〔The invention's effect〕

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

[Brief description of drawings]

1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is an operation flow diagram for explaining the operation of the present invention, FIG. 4 is an optical disk configuration diagram, FIG. 5 is an operation flow chart for explaining the conventional optical disc replacement processing. 1 ... Optical disc control unit, 2 ... Optical disc drive circuit, 3 ... Read unit, 4 ... Write unit, 5 ... Primary alternation area final sector detection circuit, 6 ... Dummy block generation circuit.

Claims (1)

[Claims] 1. An erasable / re-recordable 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 last sector of the primary replacement area. And dummy block generation means (6) for generating dummy data
The replacement processing method in an erasable / re-recordable optical disk device, characterized in that when the erased sector is the last sector of the primary replacement area, dummy data is recorded in the last sector.