JPH0235663A - Alternate processing system for magneto-optical disk device - Google Patents

Abstract

PURPOSE:To search a targeted alternate sector in a short time even when a defective sector exists in an alternate area by writing dummy data on an alternate defective sector after completing alternate write when the defective sector is found out in the alternate area at the time of performing a write operation. CONSTITUTION:In the case of generating a defect in write data by the write operation in which an arbitrary sector N in a user area 10 is designated, the alternate write is performed by searching the null sector in the alternate area 12. Also, in the case of generating the defect in the write data by the alternate write, the alternate write on succeeding null sectors are repeated until a normal write result can be obtained, and the dummy data is written on the alternate sector in which defect is generated after completing the alternate write. In such a way, it is possible to search the alternate sector in the user area 10 in which sector defect is generated in a short time even when the defective sector exists in the alternate sector, and to shorten an alternate processing time remarkably.

Description

[Detailed Description of the Invention] [Summary] Regarding a replacement processing method for a magneto-optical disk device that can be loaded into a vehicle again, the present invention aims to search for a desired replacement sector in a short time even if a bad sector exists in the replacement area. , When a bad sector is found in the alternative area during a write operation, dummy data is inserted into the alternative bad sector after the completion of the alternative write, and on the other hand,
When reading dummy data in the continuous replacement area operation,
The read operation is configured to skip to the next alternative sector read operation without performing a retry operation.

[Industrial Application Field] The present invention relates to a replacement processing method for a rewritable magneto-optical disk device.

In recent years, with the practical use of re-writable optical discs, external storage for computers has become popular. Development of a magneto-optical disk device to be used as a device is progressing.

In such a magneto-optical disk device, a spare area is provided in order to deal with sector defects in the user area.

However, if a sector defect occurs in the user area, a sector defect may also occur in the spare area used, and even if a bad sector exists in the spare area, the target spare sector can be searched at high speed. It is desirable to do so.

[Prior Art] FIG. 6 is an operational flow diagram showing a data writing operation of a conventional magneto-optical disk device.

In FIG. 6, when a command to write data to sector N is given by the host, sector N in the user area is searched and data is written in step S1.

Next, a verify read is performed in step S2 to confirm the data written in sector N, and it is checked in step S3 whether the read data is normal. If it is normal, the process is terminated.

On the other hand, if the read data is defective, step S
In step S5, the first free sector M of the spare area is set to the sector counter x, and data is written in the spare sector X in step S5. Subsequently, in step S6, a verify read of the replacement sector x is performed, and in step S7, it is checked whether or not it is normal. If it is normal, the replacement sector writing process is ended.

If data quality is determined in step S2, step S8
Increment the sector counter When it is determined that the written data is normal, the series of replacement processing is completed.

FIG. 7 is an operation flow diagram showing a data reading operation of a conventional magneto-optical disk device.

In FIG. 7, when a command to read sector N of the user area is received from the host, the retry counter is first reset in step S1, then the specified sector N is read in step S2, and the read data is normal in step S3. If so, the process ends.

On the other hand, if it is determined in step S3 that the read data is defective, the retry counter is incremented in step S4, and it is checked in step S5 whether or not the retry counter has overflowed, and the process returns to step S2 to read the sector N again. Do this.

That is, since there is a possibility that the soft error will be resolved by repeating the read operation a plurality of times, the retry operation is repeated until the retry counter overflows.

When an overflow of the retry counter is determined in step S5 by this retry operation, the process proceeds to step S6, where the sector counter x is set to the first sector L of the replacement area, the retry counter is reset in step S7, and the replacement is performed in step S8. The sector, ie, the first sector L of the spare area, is read, and in step S9 it is checked whether the read data is normal.

If the read data is normal, the process advances to step 313 and checks whether sector X is a replacement sector for sector N. If it is a replacement sector for sector N, then the replacement sector
The read data is transferred to the host and processing ends.

If sector Then, a read operation for the next replacement sector is performed in step S8, and the same process is repeated until sector x is determined to be the replacement sector for sector N in step S13.

On the other hand, in the process of searching for a replacement sector for sector N, if it is determined in step S9 that the read data is F-, the i.ry counter is incremented and step S9
10, it is checked whether the retry counter has overflowed or not, and the retry operation is repeated until normal read data is obtained in step S9 or it is determined that the retry counter has overflowed in step S10, and then the sector counter X is checked in step S12. is incremented to proceed to the next replacement sector read operation.

By the way, in general magneto-optical disks, the ID code used for sector search is preformatted at the manufacturing stage.

FIG. 8 shows the sector format of a magneto-optical disk, which includes a preformed physical ID followed by a user format section that can be arbitrarily formatted by the user.

Since the preformatted physical ID cannot be changed, it is necessary to record the logical ID in the user area.

This logical ID is generally recorded as part of the data, as shown in FIG.

For user area, preformatted physical I
There is a one-to-one correspondence between D and the logical ID of the user area.

However, with regard to the spare area, since there is no correspondence between the physical ID and the logical ID, it is not possible to specify the sector of the spare area from the physical ID.

For this reason, in the replacement process when reading data shown in Figure 7, when a sector defect occurs in the user area, the first sector of the replacement area is searched sequentially, and the logical ID included in the read data of the replacement sector is searched sequentially. By repeating the process of determining whether or not a defective sector is a replacement sector, the target replacement sector can be found.

[Problems to be Solved by the Invention] However, in such conventional replacement processing when data continues to flow, when reading the replacement sector, as shown in FIG. Even if there is a defect in the indicated data area and the logical TO has been read normally and is found to be the intended replacement sector, there is an error in the read data, so the retry operation is repeated multiple times until the retry counter overflows. As a result,
The next replacement sector must be searched for after the retry counter overflows.

Here, one try operation requires the processing time of one rotation of the disk, and the waiting time for disk rotation until the retry counter overflows becomes long, and if a sector failure occurs in alternative processing, read operation of the intended alternative sector is performed. There was a problem in that the processing time required to perform the process was extremely long.

The present invention has been made in view of such conventional problems, and provides a replacement processing method for a magneto-optical disk device that can search for a desired replacement sector in a short time even if a bad sector exists in the replacement area. The purpose is to

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

In FIG. 1, in the present invention, when a defect occurs in the write data due to a write operation that specifies an arbitrary sector N of the user area 10 ( If a defective sector occurs, a free sector in the spare area 12 is searched for and a spare write is performed, and if a defect occurs in the data written by this spare write, a subsequent spare sector is further written to a normal spare free sector. The process is repeated until a write result is obtained, and after completion of this alternate writing, dummy data is written into and out of the defective alternate sector.

On the other hand, in the present invention, regarding the read operation shown in FIG. After a predetermined number of try operations, performs a read operation sequentially from the first sector of the replacement area 12 to determine whether it is a replacement sector for the bad sector N in the user area vi, 10;
When dummy data is read in the read operation of the spare sector, the read operation of the next spare sector is skipped without performing a retry operation.

[Operation] In the sparing processing method of the present invention having such a configuration, if a bad sector is found in the sparing area during a write operation, it is determined that the sector is bad after the spacing write is completed. If dummy data that has no particular meaning as read data is written to a replacement sector and the dummy data is read by replacement processing during a read operation, even if it is a bad sector, the next replacement will be performed without performing a retry operation. It is possible to skip to the sector read operation, and even if there is a bad sector in the replacement sector, the replacement sector in the user area where the sector defect has occurred can be searched in a short time, greatly reducing the replacement processing method. can do.

[Embodiment] FIG. 2 is a block diagram showing an embodiment of the present invention.

In FIG. 2, a processor 14 controls access to the magneto-optical disk based on write commands or read commands received from a host device via an interface control circuit 16, and a sector buffer access section is included in the processor 14a. Built-in. In FIG. 2, solid lines indicate data lines, and broken lines indicate control lines.

A buffer control circuit 18 that controls a sector buffer 120 is provided following the interface control circuit 16, and stores write data transferred from a host device or read data read from a magneto-optical disk in the sector buffer 20, and It is designed to absorb the difference between the disk access speed and the transfer speed to the host device.

The buffer control circuit 18 is provided with a write formatter 22 and a modulation circuit 24 as a write system, and a demodulation circuit 26 and a word formatter 28 as a read system.
A read-only error correction circuit 30 is provided for the read formatter 28.

Further, a work memory 32 is connected to the processor 14, and the work memory 32 is provided with a sector information storage section 34 and a retry counter register 36.

Next, the data write operation of the present invention will be explained with reference to the operation flow diagram of FIG.

When a write command specifying an arbitrary sector N in the user area is received from the host device to the magneto-optical disk control device, first, in step S1, a write operation to the specified sector N is performed. Subsequently, in step S2, the write data written in sector N is verified and read, and in step S3, it is checked whether the read data is normal or not. If it is normal, the write operation is ended.

On the other hand, if there is an error in the read data, the process proceeds to step S4, where the sector counter .

When the first empty sector M of the spare area is set in the sector counter Check whether the read data is normal.

If the write data written to the alternative sector N in step S7 is normal, the process proceeds to step S8, and meaningless dummy data is re-populated as read data into the defective sector N of the user area 10 in FIG. Finish the series of processing.

On the other hand, if the read data written to the alternative sector N in step S7 is abnormal, the process advances to step S9, where the sector up counter X is incremented, and step S
In Step 5, an alternative write operation is performed on the next vacant sector X=M+1, and in Step S7 it is determined whether the read data obtained by the verify read in Step S6 is normal.

If the write data written into the alternative sector N+1 is normal, the process proceeds to step S8, where dummy data is re-written into the bad sector N of the user area 10 and the bad sector N of the spare area 12, and the series of processes ends. .

Of course, if the read data in the second alternative area N+1 is also defective in step S7, the sector counter is further incremented and an alternative write operation is performed on the subsequent alternative vacant sector, and the alternative write operation is performed in step S7. The same process is repeated until the read data is determined to be normal, and if it is determined to be normal, dummy data is rewritten to the defective sectors of the user area 10 and replacement area 12 that were previously determined to be defective. .

FIG. 4 is an operation flowchart when a data read operation is performed in a state where dummy data has been written to a defective sector by the data write operation shown in FIG.

In FIG. 4, suppose that the magneto-optical disk WJ device receives a read command for sector N shown in the user area 10 in FIG. Read sector N of area 10. Subsequently, in step S3, it is determined whether the read data is normal or not, and if it is normal, the series of read operations is ended.

On the other hand, if an error in the read data is determined in step S3, the process proceeds to step S4, where the retry counter is incremented, and the retry operations from steps $2 to S4 are repeated until an overflow of the retry counter is determined in step S5. . As a result of this retry operation, if the error in the read data of sector N is due to a soft error, normal read data is obtained as the retry operation is repeated, and the series of processing ends.

On the other hand, if sector N has a hardware sector defect, no normal data can be obtained even after repeated retry operations, and if it is determined in step S5 that the retry counter has overflowed, the process proceeds to step S6. The first sector L of the spare area 12 shown in FIG.
Set to .

Subsequently, in step S7, the retry counter is reset, and in step S8, sector X, where X=L is set, is read. Subsequently, it is determined in step S9 whether the read data of sector If it is determined in step S10 that the read data is normal, the process advances to step S15 to check whether sector X is a replacement sector for sector N. If it is a replacement sector, the read data of sector L is transferred to the host device Finish the read operation.

On the other hand, if it is determined in step S15 that sector
If it is not a spare sector, the process proceeds to step S14, where the sector counter X is incremented, and the process returns to step S8, where the second sector L+1 of the spare area 12 is read.

Through such processing, as shown in Figure 5, the sector search for the track portion shown by the shaded area is completed, and during the data write operation in Figure 3, it is determined to be a bad sector and dummy data is written. If the sector read of the alternative sector N is performed in step S8, it is determined in step S9 that the data is dummy data, and the process proceeds to step 313, where it is determined that sector M is a bad sector and a try operation is performed based on the dust 1 to lie counter. Instead, it is determined in step S13 whether or not it is the final replacement sector, and since it is not the final replacement sector, the sector counter X is incremented in step S14 and the process skips to the next replacement sector M+1 read operation. By skipping to the alternative sector M+1, read data is normally obtained, and when it is determined in step S15 that sector end.

Of course, if dummy data is obtained when alternative sector M+1 is read, the retry operation is similarly skipped to the next sector M+2 read operation.

Therefore, in the alternative processing method of the present invention, the replacement area 1
Even if a bad sector exists in 2, dummy data is written to the alternative sector determined to be a bad sector during a data write operation, and when dummy data is read by reading the alternative sector during a read operation. In this case, the read operation of the next alternative sector is skipped without performing the try operation that was conventionally performed when a sector is determined to be a bad sector. You can search by time.

In addition, in the data write operation of FIG. 3, dummy data is also written to/from the defective sector N of the user area 10 of FIG. Regarding the operation, if dummy data is obtained, the process may immediately proceed to alternative processing without performing a retry operation.

[Effects of the Invention] As described above, according to the present invention, even if a bad sector exists in a spare area, if a bad sector is found in the spare area during a write operation, a spare write operation is performed.

(Completion of operation) Dummy data is written to the replacement bad sector, so when the dummy data is read in the replacement area successive operation, the next operation is performed without performing the try operation that was conventionally performed when a bad sector was detected. The read operation of the replacement sector can be skipped, and even if a defective sector exists in the replacement area, the target replacement sector can be searched for in a short time, and high-speed replacement processing can be realized.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of the present invention; Fig. 2 is a configuration diagram of an embodiment of the present invention; Fig. 3 is a flow diagram of a data write operation of the present invention; Fig. 4 is a flow diagram of a data read operation of the present invention; Figure 5 is an explanatory diagram of reading and writing to track sectors according to the present invention; Figure 6 is a flowchart of a conventional data writing operation; Figure 7 is a flowchart of a conventional data reading operation; Figure 8 is a sector format configuration of a magneto-optical disk. Figure: Figure 9 is an explanatory diagram of bad sectors. In the figure, user area replacement area processor sector buffer 1 access section interface control circuit buffer control circuit sector buffer 7 write formattuta modulation circuit demodulation circuit read formattuta error correction circuit work memory sector information storage section retry counter register small invention red + tge mouth Moon map Figure 1 To light Moon small data number Shin h Yaka 4,000 flow times Figure 3 Sector Figure 5 Narrowing! Shameful T-9 shoe'yh's work) Flow episode 6 Figure Pre-format 1 - Service 1 format combination 9 disk φ sector format Figure 8 Figure 8 Fugitive firewood 9 Sector defect fortune-telling Figure 9

Claims (2)

[Claims] (1) In a rewritable magneto-optical disk device, if a sector failure occurs due to a write operation that specifies an arbitrary sector (N) in the user area (10), an alternative area (
12) Search for an empty sector and perform replacement writing, and if a sector failure occurs during the replacement writing, repeat the replacement writing to the subsequent replacement empty sector until a normal write result is obtained, and complete the replacement writing. A replacement processing method for a magneto-optical disk device characterized by writing dummy data into a replacement sector that later becomes defective. (2) In a rewritable magneto-optical disk device, if a bad sector occurs during a read operation of any sector (N) in the user area (10), a replacement area (12) is created after a predetermined number of retries. It is determined whether the sector is a replacement sector for the bad sector (N) in the user area (10) by performing read operations sequentially from the first sector, and when dummy data is read in the read operation of the replacement sector, a retry operation is performed. 1. A replacement processing method for a magneto-optical disk device characterized by skipping to a read operation of the next replacement sector.