JPH05128734A - Data recording/reproducing method for magneto-optical disk device - Google Patents

Abstract

PURPOSE:To shorten the data recording/reproducing time of a magneto-optical disk with respect to the recording/reproducing method for a magneto-optical disk device having secondary defective sectors. CONSTITUTION:Contents of a spare sector area having alternate sectors where which store a list of secondary defective sectors and data of secondary defective sectors in the recording area of the magneto-optical disk are stored in an external storage device 10. When a reproducing head is moved to a secondary defective sector of the magneto-optical disk at the time of data reproducing, data stored in the external storage device is used as data of the alternate sector corresponding to the secondary defective sector. Thus, the seek operation of the reproducing head from the secondary defective sector to the alternate sector is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing method for a magneto-optical disk device, and more particularly to a recording / reproducing method for a magneto-optical disk device having a secondary defective sector.

[0002]

2. Description of the Related Art A conventional recording / reproducing method for a magneto-optical disk device will be described with reference to FIGS. The details of the layout of the magneto-optical disk are shown in FIG. Magneto-optical disk is 1 from track 0 to track 18750
It is composed of 8751 tracks, and each track is composed of 17 sectors from the 0th sector to the 16th sector.

A DMA (Defect Mana) is used to manage defective sectors at the innermost and outermost circumferences of the recording area of the magneto-optical disk.
area, and the rest of the recording area is the user area. The innermost DM of the recording area of the magneto-optical disk
Area A is an area of three tracks from the 0th track to the 2nd track. The 0th track, 0th sector, DDS (Dis
(K Definition Structure) recording area in which information about the structure of the magneto-optical disk is recorded. PD from the 0th track 1st sector to the 1st track 7th sector
L (Primary Defect List) and SDL (Secondary Defect)
List) recording area. PDL is a primary defect (PD = PD) which is a defect detected at the time of formatting a magneto-optical disk.
SDL is a list of sectors with Primary Defect)
Is a list of sectors having a secondary defect (SD = Secondary Defect) which is a defect detected during actual recording / reproduction of the magneto-optical disk. The 8th sector on the 1st track is a recording area of the DDS, and the 9th sector to the 2nd sector on the 1st track
The recording area up to the track 15th sector is the PDL and SDL. The 16th sector on the final second track of the DMA area is a reserve (Res = Reserve) sector.

The outermost DM of the recording area of the magneto-optical disk
The area A is an area of three tracks from the 18748th track to the 18750th track. Similar to the DMA area, recording areas of DDS, PDL, and SDL are provided, and the last sector is a spare sector. The user area of the recording area is divided into one or more groups. Each group is composed of a user data area provided for recording data and a spare sector area provided as an area of a replacement sector of a secondary defective (SD) sector in the user data area. The capacity of the spare sector area is 2048 sectors at the maximum (2 MB at the maximum). If there is a secondary defective sector in the user data area, data is recorded in a predetermined spare sector in the spare sector area instead of the secondary defective sector.

Details of the recording / reproducing method in the conventional magneto-optical disk will be described with reference to FIG. When a defect (primary defect) is detected during formatting, the primary defective sector PD is excluded from the logical space and treated as if it did not exist. Information about the primary defective sector PD is already recorded in the DMA area as PDL.

When a defect (secondary defect) is detected during actual recording / reproduction, this secondary defective sector SD cannot be excluded from the logical space and is therefore recorded in the spare sector of the same group. For example, when the magneto-optical head is recording data in the order of sectors K-2, K-1, and K of a certain track, the sector K + 1, which is the next recording sector, is detected as the secondary defective sector SD. When it becomes impossible to record the data, the magneto-optical head seeks to the replacement sector K + 1 in the spare sector area, records the data in the replacement sector K + 1, and then seeks again to record the data in the sector K + 2 next to the secondary defective sector SD. To do. The magneto-optical head also performs the same seek operation during reproduction. The information on the secondary defective sector SD is obtained by the SDL of the DMA area by the magneto-optical head each time a replacement sector is set in the secondary defective sector SD.
Recorded in.

[0007]

As described above, when the secondary defective sector SD occurs, it is necessary to seek the magneto-optical head to the alternate sector of the spare sector area at the time of recording / reproducing the data. There is a problem that the time required for recording / reproduction increases and the data transfer rate decreases. Further, there is a problem that as the occurrence of the secondary defective sector SD increases, the ratio of the seek time of the magneto-optical head to the time required for recording / reproducing increases.

It is an object of the present invention to provide a recording / reproducing method for a magneto-optical disk device which shortens the time for recording / reproducing data on the magneto-optical disk.

[0009]

The above object is to externally store the contents of a spare sector area having a list of secondary defective sectors in a recording area of a magneto-optical disk and a replacement sector storing data of the secondary defective sector. Data stored in the device and stored in the external storage device as data of the replacement sector corresponding to the secondary defective sector when the magneto-optical head moves to the secondary defective sector of the magneto-optical disk during data reproduction. Is used to prevent the seek operation of the magneto-optical head from the secondary defective sector to the replacement sector, thereby achieving the data recording / reproducing method of the magneto-optical disk device.

[0010]

According to the present invention, since the seek operation of the magneto-optical head can be reduced, the time for recording / reproducing the data of the magneto-optical disk can be shortened.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording / reproducing method for a magneto-optical disk device according to a first embodiment of the present invention will be described with reference to FIGS. In the recording / reproducing method of the magneto-optical disk device according to the present embodiment, the data of the secondary defective sector SD is stored in the external storage device (RAM) in advance so that the magneto-optical head does not perform useless seek operation. The feature is that the data reproduction speed is improved in this way.

FIG. 1 is a block diagram for explaining the recording / reproducing method of the magneto-optical disk device of this embodiment. FIG. 2 is a diagram for explaining the details of the recording / reproducing method of the magneto-optical disk device of this embodiment. First, in FIG. 1, when the magneto-optical disk device 1 is powered on and the magneto-optical disk reaches a predetermined number of revolutions to complete the startup of the magneto-optical disk device 1, the defective sector in the recording area of the magneto-optical disk is removed. A list of secondary defective sectors (SDL) recorded in the managed DMA area is externally connected to the internal bus 8 via the internal interface 2 and the magneto-optical disk controller 6 provided in the input / output controller 4. Copy to RAM10. An ECC circuit 18 for error correction, a data buffer 20 for temporarily holding input / output data, and the like are also connected to the internal bus 8. The input / output control device 4 is built in the housing of the magneto-optical disk device 1 so that power is supplied at the same time when the magneto-optical disk device 1 is powered on.

Next, in the same manner as the above SDL copy,
The contents of the spare sector area having the replacement sector in which the data of the secondary defective sector is stored are copied to the external RAM 10. When the data is reproduced from the magneto-optical disk device 1 and transferred to the host computer 16, even if the magneto-optical head of the magneto-optical disk device 1 accesses the secondary defective sector of the magneto-optical disk, the magneto-optical head will be in the spare sector area. The seek operation of moving to the replacement sector is not performed. In FIG. 2, sectors K-2 to K of a certain track
Sector K + when reproducing data up to +2
Even if 1 is the secondary defective sector SD, the magneto-optical head does not perform the seek operation of moving to the spare sector in the spare sector in which K + 1 data is recorded. Instead, the data of the required replacement sector is output to the internal bus 8 from the external RAM 10 which already holds the data of the secondary defective sector, and the input / output interface 12 and the input / output interface cable 14 such as SCSI are connected to the internal bus 8. Via the host computer 16.

Further, when recording data on a magneto-optical disk, when a secondary defective sector occurs, a spare sector in the spare sector area is allocated, data is recorded in the spare sector, and a list of secondary defective sectors in the DMA area is recorded. (SD
L) is updated. At the same time, the SDL in the external RAM 10 is updated, and the data is written in the RAM area corresponding to the address of the spare sector in the spare sector area. This eliminates the need for the magneto-optical head to seek to the alternate sector in the spare sector area during the next reproduction.

Thus, for example, by providing the external RAM 10 in the input / output control device 4, it becomes possible to perform data recording / reproduction of the magneto-optical disk device having a high data transfer rate. A recording / reproducing method of the magneto-optical disk device according to the second embodiment of the present invention will be described with reference to FIGS.

In this embodiment, a patent application by the same applicant as the present application (Japanese Patent Application No. 2-2321 filed on Aug. 31, 1990) is used.
No. 47), the recording / reproducing method of the magneto-optical disk device according to the present invention is applied to the magneto-optical disk device provided with two magneto-optical heads. The proposed magneto-optical disc device has a magneto-optical disc cartridge width of 40 mm defined by the ISO standard.
By providing two magneto-optical heads in the head window, and devising control of the two magneto-optical heads to efficiently record and reproduce data, a large amount of data can be transferred at high speed.

A magneto-optical disk of the magneto-optical disk device used in this embodiment is shown in FIG. In the magneto-optical disk used in this embodiment, the entire recording area of the magneto-optical disk is divided into an inner recording area Ra and an outer recording area Rb. The inner recording area Ra is accessed by a magneto-optical head A (not shown), and the outer recording area Rb is accessed by a magneto-optical head B (not shown).

A DMA (Defect Management Area) area Rad is provided in the innermost circumference of the recording area Ra for managing defective sectors.
Is provided, and the DMA area Rb is also provided on the outermost circumference of the recording area Rb.
d is provided. The rest of the recording area Ra is the user area Rau, and the rest of the recording area Rb is the user area Rbu.
Is. The details of the layout of the magneto-optical disk are shown in FIG. The magneto-optical disk is composed of 18751 tracks from the 0th track to the 18750th track, and each track is composed of 17 sectors from the 0th sector to the 16th sector.

The DMA area Rad of the recording area Ra is an area of three tracks from the 0th track to the 2nd track. The 0th track, 0th sector is the DDS (Disk Definition
(Structure) recording area in which information about the structure of the magneto-optical disk is recorded. From the 0th track 1st sector to the 1st track 7th sector, PDL (Primary D
It is a recording area for an efect list) and an SDL (secondary defect list). PDL is a primary defect (PD = Primary Defe) that is a defect detected at the time of formatting a magneto-optical disk.
ct) is a list of sectors, and SDL is a list of sectors having secondary defects (SD = Secondary Defect) which are defects detected at the time of actual recording / reproduction of the magneto-optical disk. The first track, eighth sector is a DDS recording area, and the first track, ninth sector to the second track, first sector.
Up to 5 sectors are recording areas for PDL and SDL. DM
The final second track, 16th sector of the area A Rad is a reserve (Res = Reserve) sector.

The DMA area Rbd of the recording area Rb is the 18th
It is an area of three tracks from the 748th track to the 18750th track. DDS as well as DMA area Rad,
PDL and SDL recording areas are provided, and the last sector is a spare sector. User area Ra of recording area Ra
The u is divided into groups 1 to 4, and the user area Rbu of the recording area Rb is also divided into groups 5 to 8. Each group is composed of a data sector provided for recording data and a spare sector provided as a replacement sector of a secondary defective (SD) sector in the data sector. When there is a secondary defective sector in the data sector, data is recorded in the spare sector instead of the secondary defective sector.

Details of the recording state in the magneto-optical disk are shown in FIG. 5 by taking the group 1 of the recording area Ra and the group 5 of the recording area Rb as an example. The state is shown in which data of 128 sectors is written in each of group 1 and group 5. When a defect (primary defect) is detected during formatting, the primary defective sector PD is excluded from the logical space and treated as if it did not exist.
For example, the seventh sector of the fifth track is the primary defective sector PD
Therefore, the next data <41> following the data <40> recorded on the fifth track and sixth track is recorded on the fifth track and eighth track. The primary defective sector PD
The information related to PDL is already recorded in the DMA area Rad as PDL.

When a defect (secondary defect) is detected during actual recording / reproduction, this secondary defective sector SD cannot be excluded from the logical space, and is therefore recorded in the spare sector of the same group. For example, when a defect is detected in the 5th track 9th sector and the data cannot be recorded as the secondary defective sector SD, the 10th track 13th sector at the head of the spare sector becomes the replacement sector, and the data <42>
Is recorded. The information on the secondary defective sector SD is recorded in the DMA area Rad by the magneto-optical head A every time a replacement sector is set in the secondary defective sector SD.

Further, the data <42> of the replacement sector and the contents of the SDL of the DMA area Rad are also stored in the external RAM 10 described with reference to FIG. 1 in the first embodiment. In this embodiment, two magneto-optical heads A and B are used.
, The data of the replacement sector and the DMA area R of the areas accessed by the respective magneto-optical heads A and B are used.
External RAM1 so that the contents of SDL of ad can be stored
The inside of 0 is divided into two and used.

1 and 5 show control by a control means (not shown) when recording continuous data D of several sectors by the magneto-optical disk device.
Will be explained. The continuous data D to be recorded is divided into data d1, data d2, ... In units of sector capacity. First, in FIG. 5, the first data d1 corresponds to the fifth data of the recording area Ra (group 1) by one magneto-optical head A.
Written to sector 6 of the track. The next data d2 is recorded on the recording area Rb (group 5) by the other magneto-optical head B.
Should be written to the 7th sector of the n + 2th track of the following, but when this sector is detected as a secondary defective sector,
The magneto-optical head B starts the seek operation, allocates the 13th sector of the (n + 7) th track of the spare sector area as an alternate sector, and writes the data d2 therein. Next, new secondary defective sector information is added to the list of secondary defective sectors already stored in the external RAM 10 when the magneto-optical disk device is started up, and the spare sector area of the spare sector area (n + 7th track, 13th sector) is added. The data d2 of is added and stored.

Next, the next data d3 is written by the magneto-optical head A again in the fifth track, eighth sector, skipping the primary defective sector (fifth track, seventh sector).
The next data d4 is written by the magneto-optical head B in the (n + 2) th track and (8th) sector following the (n + 2) th track and 7th sector. In the same manner, the two magneto-optical heads A and B are simultaneously used to record continuous data.

As described above, the recording time can be halved by distributing the continuous data to the two magneto-optical heads A and B for writing. When reproducing the continuous data D from the magneto-optical disk recorded in this way, first, the magneto-optical head A accesses the sixth sector on the fifth track to read the data d1. At the same time, in order to read the data d2, the 7th sector of the (n + 2) th track is accessed by the magneto-optical head B. Since this sector is a secondary defective sector, the data d2 stored in the external RAM 10 in FIG. The data is output to the internal bus 8 in the device 14 and transferred to the host computer 16.
At this time, the magneto-optical head B does not perform the seek operation to the replacement sector, and when the transfer of the data d2 is completed by the external RAM 10, the reading of the eighth sector, which is the sector next to the seventh defective sector on the (n + 2) th track, which is the secondary defective sector. Get into action.

Then, the magneto-optical head A accesses the fifth track, eighth sector to read the data d3, and the magneto-optical head B accesses the n + 2th track, eighth sector to read the data d4. 2 in the same way
The data d5, d6, ... Are read by two magneto-optical heads A, B, and the data d1, d2, ... Read by the magneto-optical heads A, B are arranged alternately to form continuous data D.

In addition to the data being read by the two magneto-optical heads A and B as described above, it is necessary for the magneto-optical head to seek to the alternate sector even if the secondary defective sector is detected. Since it does not exist, the read time can be further shortened. Therefore, according to this embodiment, a large amount of data can be transferred at high speed to record / reproduce.

Since the magneto-optical disk is rotated at 1800 rpm by the spindle motor in this embodiment, data of 522 Kbyte / sec can be transferred for each magneto-optical head. Therefore, by simultaneously recording / reproducing with the two magneto-optical heads A and B, 1 Mbyte / sec.
Data transfer is possible. High-speed data transfer is possible by rotating the spindle motor at a higher speed.
Considering mechanical resonance, it is currently difficult to rotate at a speed twice as fast as the conventional one. In this embodiment, high-speed data transfer comparable to high-speed rotation exceeding the conventional limit is possible without increasing the load on the objective lens servo system and the signal processing system.

The present invention is not limited to the above embodiment, but various modifications are possible. For example, in the above embodiment, if a secondary defective sector occurs during recording, data is written to the replacement sector of the spare sector area on the magneto-optical disk, the SDL of the DMA area is updated, and the contents of the external RAM 10 are updated at the same time. However, the contents of the SDL and the spare sector area are copied to the external RAM 10 only when the magneto-optical disk apparatus is started up, and the secondary defective sector newly generated at the time of data transfer between the host computer 16 and the magneto-optical disk apparatus 1 is executed. It is also possible to update the SDL and the spare sector area in the external RAM 10 only.

In this case, when terminating the data transfer between the host computer 16 and the magneto-optical disk device 1, the contents of the external RAM 10 having the updated SDL and data are turned off before the power of the magneto-optical disk device is turned off. It is necessary to record and update in the DMA area and a predetermined spare sector area of the magneto-optical disk of the magneto-optical disk device 1.

[0032]

As described above, according to the present invention, the time for recording / reproducing data on the magneto-optical disk can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a recording / reproducing method of a magneto-optical disk device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a recording / reproducing method of the magneto-optical disk device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing details of a recording area of a magneto-optical disk of a magneto-optical disk device used in a second embodiment of the present invention.

FIG. 4 is a diagram showing details of a recording area of a magneto-optical disk of a magneto-optical disk device used in a second embodiment of the present invention.

FIG. 5 is a diagram showing details of a data recording state of a magneto-optical disk used in the second embodiment of the present invention.

FIG. 6 is a diagram showing details of a layout of a magneto-optical disk.

FIG. 7 is a diagram showing a recording / reproducing method of a conventional magneto-optical disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk device 2 ... Internal interface 4 ... Input / output control device 6 ... Magneto-optical disk control device 8 ... Internal bus 10 ... External RAM 12 ... Input / output interface 14 ... Input / output interface cable 16 ... Host computer 18 ... ECC Circuit 20 ... Data buffer

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[Procedure amendment]

[Submission date] January 6, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Details of the recording state in the magneto-optical disk are shown in FIG. 5 by taking the group 1 of the recording area Ra and the group 5 of the recording area Rb as an example. The state is shown in which data of 128 sectors is written in each of group 1 and group 5. When a defect (primary defect) is detected during formatting, the primary defective sector PD is excluded from the logical space and treated as if it did not exist.
For example, the seventh sector of the fifth track is the primary defective sector PD
Therefore, the next data <41> following the data <40> recorded on the fifth track and sixth sector is recorded on the fifth track and eighth sector. The information on the primary defective sector PD is already recorded as PDL in the DMA area Rad.

Claims (3)

[Claims] 1. A content of a spare sector area having a list of secondary defective sectors of a recording area of a magneto-optical disk and a replacement sector storing data of the secondary defective sector is stored in an external storage device, and at the time of data reproduction. When the magneto-optical head moves to the secondary defective sector of the magneto-optical disk, by using the data stored in the external storage device as the data of the replacement sector corresponding to the secondary defective sector, the secondary A data recording / reproducing method of a magneto-optical disk device, wherein a seek operation of the magneto-optical head from a defective sector to the replacement sector is not performed. 2. The data recording / reproducing method of the magneto-optical disk apparatus according to claim 1, wherein when a new secondary defective sector occurs during data recording, the list of the secondary defective sectors of the magneto-optical disk is updated. , Recording data in a new replacement sector in the spare sector area, adding information of the new secondary defective sector to update the list of the secondary defective sector stored in the external storage device, A data recording / reproducing method for a magneto-optical disk device, characterized in that new spare sector data is added to the contents of the spare sector area stored in the external storage device and stored. 3. The data recording / reproducing method of the magneto-optical disk device according to claim 1, wherein when a new secondary defective sector occurs during data recording, the information of the new secondary defective sector is added to the external Updating a list of the secondary defective sectors stored in a storage device, and adding and storing data to be recorded in the new secondary defective sectors in the contents of the spare sector area stored in the external storage device; At the end of the data recording / reproducing work, the secondary defective sector of the magneto-optical disk is recorded by using the list of the secondary defective sectors stored in the external storage device and the contents of the spare sector area stored in the external storage device. The spare sector area is updated by updating the list of defective sectors and additionally recording data in a new replacement sector in the spare sector area. Data recording of magneto-optical disk device
How to play.