JPH01159870A - Method for arranging alternating information - Google Patents

Abstract

PURPOSE:To decrease the load of a controller, to prevent plural pieces of same information from being simultaneously destroyed, and to execute an effective alternating management by multiple-writing alternating information and preventing locating the multiple-written same alternating information in sectors to be lined in the same radius direction. CONSTITUTION:For an alternating management sector in an alternating management area 201, a pair is composed of plural sectors, the sectors have management information to be old by one generation and newest management information, and the same information is written in many pieces. In such a case, the same alternating information is inhibited from being arranged in the sectors to be lined on the same radius. Thus, a release from the discrepancy of the alternating management of an alternation can be executed, the load of the controller can be decreased, simultaneously, plural pieces of the same information cannot be simultaneously destroyed, and the effective alternating management can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method for arranging alternative information on a recording medium of a magneto-optical disk rod.

[Prior Art] Many alternative processing methods have been proposed for replacing defective sectors due to media defects or acquired defects (e.g. scratches, dust) with other sectors in conventional magneto-optical disk drive devices. In general, an alternative sector (sector after replacement) is managed using 0 alternative management information, and the alternative management information is also recorded on the same medium as the alternative sector.

By the way, compared to other recording media, magneto-optical disks generally have a high error rate due to defects and have a large total storage capacity, so the number of replacements is on the order of several hundred or more, and they are divided into several sectors to store replacement management information. are recorded. In addition, the sector that records alternative management information may also become a defective sector due to a defect, and this probability cannot be ignored, that is, 1
There is a need to consider replacing alternative management information as well.

[Problems to be solved by the invention] As described above, in a magneto-optical disk drive device,
Considering that alternative management information is also substituted, it not only imposes a burden on the controller of the magneto-optical disk device, but also
There is a problem that the processing speed of the magneto-optical disk device decreases.

[Means for Solving the Problems] The present invention arranges at least two pieces of the same alternative information on the same medium, and moreover, arranges the same pieces of alternative information in sectors lined up on the same radius. It is prohibited.

[Operation] By overwriting the same alternative information, the present invention can be freed from the contradiction of alternative management and reduce the load on the controller. In addition, since the same overwritten alternative information is arranged so as not to be placed in sectors lined up in the same radial direction, multiple pieces of the same information will not be destroyed at the same time, making effective alternative management possible. .

[Embodiment] FIG. 1 is a diagram showing the format of a magneto-optical disk showing an embodiment of the present invention.

FIGS. 2(1) and 2(2) are diagrams showing alternative management areas in the above embodiment.

The user area in the above embodiment is 10 as shown in FIG.
0 blocks AI, A2. .......

A100, and this divided block A1-A
For every 100 tracks, one alternative area is provided.

For example, a one-track alternative area 103 is provided in block A1, and the other blocks are similarly provided with one-track alternative areas.

The range of the above block is the range of seek within the field of view by the optical system (seek time 10-odd layers 5ec) (10-odd layers 5ec).
track) is preferred, but ranges other than that range may be used.

Defect information in the magneto-optical disk is recorded in the alternative management area 105, and this defect information is initially registered when producing the magneto-optical disk, or is additionally registered during format processing by the user or when a new defect is detected. Ru.

FIG. 3 shows an alternative management sector 301 in an alternative management area, and a header section 302 of this alternative management sector 301 has an alternative table 303 for the sector 301. The header section records the address and synchronization signal of that sector. FIG. 5(1) is a diagram showing a user block and an alternative block for explaining alternative processing, and FIG.
) is a diagram showing an alternative management table on memory.

Address information (defective information) of defective sectors is registered in ascending address order in one alternative management sector 301, as shown in FIGS. 3 and 5.

In the above embodiment, the alternative management sector is shown in FIG. 2 (1).
As shown in the figure, each sector is made up of 8 sectors, has one generation of old management information and the latest management information, and has the same information written four times. In this case, the same alternative information is prohibited from being placed in sectors arranged on the same radius.

Further, the reference numeral 205 shown in FIG. 2 (2) is the same as that shown in FIG. 2 (1).
2 shows a portion 202 of the format 201 of the alternative management area shown on the magneto-optical disk.

Note that the specifications of the magneto-optical disk in the above embodiment are as follows. Total recording area is 2010G) rack, user area is 1911100) rack, alternative area is 1
00 tracks, and the alternative management area is 5 tracks.

13 sectors/track, 1024 bytes/sector.

Next, the operation of the above embodiment will be explained.

First, the reading operation of alternative management information will be explained.

FIG. 6 is a flowchart showing the process of writing alternative management information when loading a magneto-optical disk in the above embodiment.

When loading of the magneto-optical disk is completed, the magneto-optical disk device writes management information to the memory within the magneto-optical disk device based on the contents of the alternative management area in the magneto-optical disk.

In other words, the contents of sectors a1 and bl of the alternative management area 201 are written to the memory of the magneto-optical disk device (SS),
sector a1. b1 is written four times each (&
r' −・”・m ar', l), I, ,.

...+tll')+ Select the one that is normally recorded from among these.

The old and new counters in the header 302 of sectors a+ and b+ (
Fig. 4 shows the header part of the alternative management sector, and compare the values of the counter consisting of bits 4 to 7 of byte l in this header part. If it is larger than the contents of sector ml~a8, write the contents of sector ml to a8 to memory (59); conversely,
If the contents of the old and new counters of a are less than or equal to the contents of the old and new counters of b, write the contents of sectors b1 to b8 to the memory (
58).

The new/old counter is incremented by 2 when the alternative information is updated. For example, sectors a1 to a8
The content of is the latest information and the value of the new/old counter is 1, the content of sectors b, -b is information from one generation ago and the value of the new/old counter is 2, and when the alternative information is updated, sectors b, -b
The contents of be are updated, the value of the new/old counter is incremented from 1 to 3, and the contents of sectors b1 to b8 become the latest information. In addition, the values of the new and old j counters are shown in Figure 7 (1
), it is the number of cycles, and has a magnitude relationship as shown in No. 7m(2).

In S8 and S9, as shown in FIG. 2(2), if the sectors (areas 205, 202) become unreadable due to the acquired defect 206, bll, b21.
b32. bs', b51. b61, l),
I.

Write b81, a+'+ 1iL2' in S9
, a31゜a42, as I, ab I,
When a71.481 is written, the alternative information written to the memory is used as an alternative management table.

Next, a write operation to an unreplaced defective sector will be explained.

Sector S3 shown in the wSs diagram is a counter that is registered in the replacement management table (a part of which is shown in FIG. 5 (2)), but for which no replacement processing has been performed. In addition, in 51B, the left address 2170-5 (2
170 is a track address, 5 is a sector address in a narrow sense) indicates sector S3, 0-0 on the right indicates that sector S3 has not been replaced, and the sector at address 2111-6 written above it. is address 219
9-3.

FIG. 8 is a flowchart showing the operation of the write process in the above embodiment, and is a flowchart showing the operation of writing to the defective sector S3.

First, search the alternative management table and check whether sector S3 (address 2170-5) is registered (S
11) If the sector S3 is registered in the alternative management table (512), it is checked whether this sector has already been replaced (S13).Actually, if the lower byte of the alternative management information 516 is 0? Find out whether or not. If the lower byte is 0, it has not been replaced, if it is other than 0, it has been replaced, and if it has not been replaced by 1, it is the unused start address pointer of the corresponding replacement block (in this example, the pointer is 506 (address 2199- 4), and Figure 5 (1)
Alternative writing is performed to the sector indicated by (S 1
6).

Then, the unused start address pointer of the alternative block is incremented (S17), and the alternative sector address is registered in the alternative management table (the post-registration status is displayed in the part indicated by reference numeral 514 in FIG. 5(3)). °) (sia), then by verifying,
Check whether writing was performed correctly (S19)
.

Next, a write operation to an unregistered defective sector will be explained.

FIG. 8 also shows the operation of writing the contents to be written into the unregistered defective sector S4 in the alternative management table in the above embodiment.

First, search the alternative management table and check whether sector 34 (address 2150-11) is registered (
s i i) If sector 4 is not registered in the alternative management table (S l 2), it is not clear at this time whether or not sector S4 is a defective sector. Write (S 15)
Then, a write check is performed to see if the write was performed correctly (, 519), and if the write cannot be performed correctly, the same sector is written again (520).

At this time, write is performed after erasing the same sector S4, and the write check is performed (321). If the write cannot be performed correctly, the sector indicated by the unused start address pointer of the corresponding alternative block (in this example, 507 (address 2)
119-5)), and increment the unused start address pointer of the alternative block.
Substitution information indicating substitution to the sector indicated by 07 is registered in the substitution management table (s i s). This state is indicated by reference numeral 515 in FIG. 5(4).

Here, when registering the above-mentioned alternative information in the alternative management table, the alternative information to be registered is inserted into a corresponding position in the table arranged in ascending order of addresses.

Furthermore, in the above flowchart, even if a defective sector exists in the replacement block, the defective sector is not replaced, but an unused sector is used instead, so m is correctly deleted.

Further, although not shown in the above flowchart, when a predetermined alternative block is used up, the alternative block is replaced by a neighboring alternative block. That is, when the alternative area within a given block is exhausted, the alternative area is replaced with an alternative area within a block located near the block.

In the above embodiment, by providing at least one alternative area in each block, the alternative processing time can be shortened, and furthermore, a decrease in recording capacity can be suppressed. Further, even if the alternative area in a block is used up, it is replaced by a nearby alternative area, so that one alternative processing time can be shortened.

Next, the read operation of the sector replaced by two will be explained.

FIG. 9 is a flowchart showing the operation of reading the replaced sector S1.

First, the replacement management table is searched to determine whether there is a replacement (531). In the replacement management table, the address information of defective sectors is arranged in ascending order of their addresses, making it easy to search for defective sectors.

If there is a registration in the alternative management table (S32) as shown by reference numeral 511 in FIG. 5(2), a seek is performed to read the alternative sector. Set it up accordingly.
The above seek is a seek within the field of view of the optical system (seek time lO
Several 1 sec) is sufficient (S33), and five alternative sectors are read out (S34).On the other hand, if there is no registration in the alternative management table in S32, the original sector is read out (S35).

Next, the operation of recording updated alternative information on the magneto-optical disk will be explained.

The substitute information updated on the memory in the magneto-optical disk device is recorded on the magneto-optical disk when the magneto-optical disk is ejected or when a write command from the host computer ends. This alternative management sector (8 sectors) is the second
It is written four times as shown in the figure. The reason for writing 4 times like this is due to acquired defects (defects due to scratches, adhesion of dust, etc.)
occurs and part of the alternative management sector is destroyed.

This is to avoid losing alternative information.

Instead of writing four times, write at least twice, such as twice or three times. In this case, the same alternative information is placed in sectors lined up on the same radius. prohibited.

Generally, acquired defects are local, and in most cases, for example, they are partially destroyed, as shown by reference numeral 206 in FIG. 2(2). However, the track pitch is 1.67
tm is narrow, so the destruction often spans several tens of racks. In this case, in the multiplexed alternative management sector, the same information (sectors) are not lined up in the same radial direction (as shown in Figure 2 (1) Each sector is arranged so that multiple pieces of the same information will not be destroyed at the same time.

In addition, in the above embodiment, instead of the magneto-optical disk,
Optical discs, magnetic discs, and other forms of recording media may also be used.

In the above embodiment, the address information (defect information) of defective sectors is registered in one alternative management sector 301 in ascending address order, but instead, the address information of the defective sector may be registered in descending address order.

[Effects of the Invention] According to the present invention, by overwriting alternative information, it is possible to be freed from the contradiction of alternative management of alternatives, and to reduce the load on the controller. In addition, since the same overwritten alternative information is arranged so as not to be placed in sectors lined up in the same radial direction, multiple pieces of the same information will not be destroyed at the same time, making it possible to perform effective alternative management. It has the effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the format of a magneto-optical disk according to the present invention. FIG. 2 is a diagram showing an alternative management area in the above embodiment. FIG. 3 is a diagram showing the format of the alternative management sector. FIG. 4 is a diagram showing the contents of the header section of one alternative management sector in the above embodiment. FIG. 5(1) is a diagram showing a user block and an alternative block to explain the impossibility of substitution, and FIGS. 5(2) to (4)
is a diagram showing an alternative management table on memory. FIG. 6 is a flowchart showing the process of writing alternative management information when loading a magneto-optical disk in the above embodiment. FIGS. 7(1) and 7(2) are diagrams showing the number of cycles, which are old and new counter values in the header, and their magnitude relationships. No. 81m is a flowchart showing the operation of write processing in the above embodiment. FIG. 9 is a flowchart showing the read operation in the above embodiment. S1~54.505...Defective sector, Sl', 32'
, 506.507...alternative sector 103.502...
・Alternative area, 105.201.205...Alternative management area. 206...Defective part, 301...Alternative management sector. 503.510... Sector address in a narrow sense. Patent applicant Canon Co., Ltd. Agent Arata Yokubo - Area Figure 2 Figure 4 Figure 9

Claims (1)

[Claims] When a sector in which information is to be recorded is a defective sector, the information to be recorded in that sector is recorded instead in an alternative sector, and the recorded information and the alternative information are recorded on the same medium. A method for arranging alternative information, characterized in that at least two pieces of the same alternative information are arranged on the same medium, and furthermore, it is prohibited to arrange the same alternative information in sectors lined up on the same radius. Alternative processing methods.