JPH05114247A - Magneto-optical disk apparatus - Google Patents

Abstract

PURPOSE:To make effective use of a piece of defective-address information and to easily investigate the cause of a change processing operation by a method wherein a defective address which has been read out by using a defective- address readout means in a formatting operation is recorded in a defective- address registration region inside a zone on a disk. CONSTITUTION:A CPU 11 inside a control part 1 controls a defective sector. In a formatting operation, a formatting processing operation is executed in a certification mode by using an unused disk (a disk which is not used after the defect has been checked by using a disk inspection apparatus). In the formatting operation, a piece of formatting information is recorded in a DDS region (DDS 1 to 4) which is used to record a piece of formatting information inside a definition zone; after that, a piece of address information on the defective sector which has been detected before by using the disk inspection apparatus. When the piece of address information on the defective sector exists, the piece of information and the piece of address information on the defective sector which has been detected in the formatting operation are recorded in a PDL region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device having a replacement (replacement) processing function for defective sectors, and in particular, enables effective use of information on defective addresses found by a disk inspection device. In addition, the present invention relates to a magneto-optical disk device that enables smooth investigation of the cause of replacement when replacement processing is performed during data recording.

[0002]

2. Description of the Related Art Conventionally, a medium (disk: storage medium) used in a magneto-optical disk device is inspected in advance by a disk inspection device for the presence of defective sectors before use. The media inspection performed by this disk inspection device is also called certify processing, and it is the process of writing certain data on the entire surface of the medium, checking whether the data is written correctly, and finding defective sectors (addresses). Therefore, it takes about 30 minutes to inspect one medium.

With respect to the defective address (sector) found by this certifying process, a predetermined sector on the disk (for example, the definition.
It is recorded in the sector after the zone). But conventionally,
Even if the certified disk is inserted into the disk device, the information on the defective address is not used and is, so to speak, ignored. Here, a conventional disk defect management system will be described with reference to the drawings.

FIG. 6 is a diagram showing a disk layout for explaining an example of a conventional disk defect management system. In the figure, USER BAND indicates a user area, SPARE BAND indicates a replacement (alternative) area, and x indicates a defective sector.

FIG. 6 shows an example of media division at the time of formatting (certify), and the top is when there is no defective sector in the group. In this case, the position and size of the user area (USER BAND) and the subsequent replacement (substitution) area (SPARE BAND) are the same as those at the time of formatting.

On the other hand, as shown in the center of FIG.
When two defective sectors (sectors marked with X) occur in the user area (USER BAND), the position of the spare area (SPARE BAND) is shifted by that amount, and the same size is secured. Similarly, as shown at the bottom of FIG. 6, when one defective sector (x-sector) is generated in the user area (USER BAND), the position of the spare area (SPARE BAND) is further increased by that sector. It shifts.

When a defective sector is detected at the time of formatting (certifying) the medium, the address of the sector is registered in the PDL list (described later) and skipped at the time of access to replace the next valid sector. Therefore, the group boundary has a variable size depending on the presence and number of defective sectors (sector slipping method).

As described above, conventionally, the disk inspection apparatus performs the processing of checking the defective address of the disk. In other words, the disc inspection device has a function of performing the same process as the certifying process (contents of the format for finding the defective address of the disc). However, although the address information of the defective sector is used in the skip operation, it is ignored in the other operations, and the information of the defective address found at some point has not been effectively used for other purposes.

Further, according to the conventional disc defect management system, when replacement processing occurs during recording on the disc,
The error content that caused the replacement process is not recorded on the disc. Specifically, when a replacement process occurs during recording on a disc, the disk device not only reports the error content to the host computer, but also reports the error content that caused the replacement process on the medium (disk). It is difficult to investigate the cause of the replacement after that because it does not perform the processing such as registering at.

FIG. 7 is a diagram for explaining an example of a conventional disk defect management method during data writing. The reference numerals in the figure are the same as those in FIG. 6, and x1 to x3 indicate defective sectors.

As shown by "x1 to x3" in FIG. 7,
When recording on a disc, for example, the user area (USER
When three defective sectors occur in (BAND), replacement processing is performed using a replacement area (SPARE BAND) in the same group (linear replacement method). In this case, the spare area (SPA
When all RE BAND) have been used, the spare area in the next group (SPARE BAND) is used as a new spare area. When these replacement processes are performed, the information of the defective sector is SDL.
It is registered in the list (described later).

As described above, when a defective sector occurs in the user area at the time of data recording, the replacement processing is performed using the replacement (alternative) area, but the error content is not recorded. There was an inconvenience that it was difficult to investigate the cause of replacement.

[0013]

SUMMARY OF THE INVENTION The present invention solves such inconveniences that occur during formatting and data recording of a conventional magneto-optical disk device, and makes effective use of information on defective addresses found by a disk inspection device. It is an object of the present invention to provide a magneto-optical disk device capable of smoothly performing an investigation of the replacement cause when the replacement processing is performed at the time of data recording.

[0014]

According to the present invention, firstly,
In a magneto-optical disk device having a defective sector replacement processing function, a defective address read means for reading a defective address on the disk found by a disk inspection device and a defective address in a zone provided at an end of the disk. A disk having a registration area and recording means for recording address information in the registration area of the first defective address are provided, and the defective address read by the defective address reading means at the time of formatting is stored on the disk. The recording is performed in the defective address registration area in the zone.

Secondly, in the magneto-optical disk device having the defective sector replacement processing function, the registration area of the error content and the replacement address for causing the replacement processing in the zone provided at the end of the disk. A disc having
A recording means for recording information in the registration area of the error content that has caused the replacement processing and its replacement address, and when the replacement processing has occurred during recording on the disc, the error content that has caused the replacement processing and The alternate address and the alternate address are recorded in a registration area in the zone on the disc.

Thirdly, the second magneto-optical disk device is provided with an error management table for recording the error content that caused the replacement process and the address of the defective sector.

[0017]

According to the present invention, an unused disc (a disc that has not been used after being checked for defects by the disc inspection device) is inserted into the disc device, and then the formatting process is executed to store the format information recording area DDS ( (See FIG. 2), the format information is recorded, and the address of the defective sector previously found by the disk inspection device and the information of the address of the defective sector found at the time of this formatting are recorded in the defective address registration area PDL (after (See FIG. 2 below), and after that, a defect area registration area SDL (see FIG. 2 below) is further created, and the format processing is completed, so that the defect address information becomes valid. The invention can be used for (the invention of claim 1).

When an error occurs at the time of recording data and the replacement process is executed, the information of the address where the error has occurred and the information of the address of the sector where the sector has been replaced are used as a subsequent defective address. Registration area SDL
(See FIG. 2 below), the code indicating the error content and the address information of the sector in which the error occurred (defective sector address) are recorded in the reserved area (see FIG. 2 below). By doing so, the cause of the replacement can be smoothly investigated (the invention of claim 2).

Further, by providing a table (see FIG. 5 described later) for recording the content of the error and the information of the defective address where the error has occurred, that is, an error management table in the disk device, The contents and the error address can be easily managed (the invention of claim 3).

[0020]

Embodiment 1 Next, the magneto-optical disk device of the present invention will be described in detail with reference to the drawings. This embodiment is mainly related to the invention of claim 1, but is also related to the inventions of claim 2 and claim 3. First, the layout of a disk (media) used in the magneto-optical disk device of the present invention will be described.

FIG. 2 is a conceptual diagram of a disk showing an embodiment of the layout on the disk and the usage state in the magneto-optical disk device of the present invention.

As shown in FIG. 2, on the disc,
Track 0 composed of sectors 0 to M, respectively
~ Track N (Max) is provided. A definition zone is provided on the inner and outer three tracks, that is, tracks 0 to 2 and tracks (N-2) to N, and all tracks in the middle are defined by the user. It is used as an area (User Area).

In the present invention, the DDS area (DDS1 to DDS4) in which the format information of the medium is recorded in the definition zone.
And a PDL area (Primary Defect) for registering a defective address found at the time of formatting the medium.
List) and an SDL area (Second) for registering a subsequent defective address generated at the time of recording on the disc.
Defect List).

Then, the information of the defective address previously found by the disk inspection device and the information of the defective address found at the time of formatting are recorded in the PDL area (claim 1).
Invention).

Further, although it is planned to be used in the future, a reserved area (Reserved) to which nothing is allocated is provided at present. In the reserved area, when the replacement processing occurs during recording on the disc, a code indicating the content of the error that caused the replacement processing and the information of the address at which the error occurred are recorded (the invention of claim 2). ).

FIG. 1 is a functional block diagram showing an embodiment of the essential configuration of the magneto-optical disk device of the present invention. In the figure, 1 is a control unit, 11 is its CPU, 12 is ROM, 13 is RAM, 14 is a data buffer, 15 is a SCSI controller, 2 is a disk controller, 3 is a disk, and 4 is a SCSI bus.

In the magneto-optical disk apparatus of the present invention shown in FIG. 1, the CPU 11 in the control unit 1 has a flow shown in FIGS. 3 (invention of claim 1) and 4 (invention of claim 2) described later. The defective sector is controlled in accordance with. Other configurations are basically the same as those of the conventional device. The host computer is connected to this magneto-optical disk device via a SCSI (Small Computer System Interface) bus 4.

Normally, at the time of formatting, there are a mode in which certify is performed and a mode in which certify is not performed, and this embodiment is a mode in which certify is performed, that is, a certify mode. Therefore, the following processing is not executed in the mode where certification is not performed. When formatting in certify mode,
An unused disk (a disk that has not been used after a defect is checked by the disk inspection device) is used as the disk 3 of No. 3, and the disk 3 is inserted into the disk device and then the formatting process is executed.

In the format, the DDS area (DDS1 to DD) for recording the format information in the definition zone (DefinitionZone) shown in FIG.
After recording the format information of the disc in S4), the address information of the defective sector previously found by the disc inspection apparatus is read. If there is information on the address of the defective sector, the address information on the defective sector and the information on the address of the defective sector found during this formatting are recorded in the PDL area.

After that, the SDL area shown in FIG. 2, that is, the SDL area for registering a subsequent defective address generated at the time of recording on the disc is created, and the formatting process is completed. The operation at the time of formatting described above, that is, the operation at the time of recording in the definition zone (Definition Zone) shown in FIG.
As shown in.

FIG. 3 is a flow chart showing the main processing flow at the time of formatting in the magneto-optical disk device of the present invention. In the figure, # 1 to # 5 indicate steps.

At the time of formatting, the flow of FIG. 3 starts. As described above, the processing shown in FIG. 3 is executed only in the certification mode even during formatting. In step # 1, all sectors of the medium are checked, and when the check is completed, the process proceeds to step # 2.

In step # 2, the format information of the medium is recorded in the DDS area (DDS1 to DDS4) provided in the definition zone (Definition Zone) of FIG. In step # 3, the information of the address of the defective sector is read from the sector in which the information of the address of the defective sector found by the disc inspection apparatus is recorded.

If a defective sector is found during the disc inspection, the address information of the defective sector is read out. Therefore, in step # 4, the information of the address of the read defective sector and the defective sector found during the formatting are read. Address information of the PDL area (Primary D
efect List). In step # 5, an SDL area for registering a subsequent defective address generated at the time of recording on the disc shown in FIG. 2 is created, and the formatting process is ended.

By the processing of the above steps # 1 to # 5, the information of the defective address found by the disk inspection apparatus is recorded in the PDL area (PDL1 to PDL4) of FIG. 2, so that it can be effectively used. ..

[0036]

Second Embodiment Next, a second embodiment of the magneto-optical disk device of the present invention will be described in detail. This example
This is related to the invention of claim 2. This embodiment is management of defective sectors when an error occurs during data recording. The configuration of the magneto-optical disk device is the same as that of FIG. 1 described above, and is different from the previous embodiment in that the CPU 11 in the control unit 1 performs control according to the flow shown in FIG. 4 described later. ..

As described above, in the conventional defective sector management method, if replacement processing occurs during recording on a disk, the error content that caused the replacement processing is not recorded on the disk. There is a disadvantage that it is not easy to investigate the cause of the replacement process. In the second embodiment, when a replacement process occurs during recording on a disc, the error content causing the replacement and its replacement address are recorded in the definition zone (D
SDL area in the efinition Zone), that is, the SDL area (SDL1 for registering a subsequent defective address)
To SDL4), the address of the defective sector and the address of the sector in which the sector is replaced are recorded, and in the reserved area (Reserved), the error code indicating the error content and the sector address in which the error has occurred (defect Sector address) and are recorded.

Therefore, as compared with the conventional defective sector management method, it becomes easier to investigate the cause of the replacement process even when the environment changes. The operation at the time of occurrence of the replacement process at the time of recording on the disk described above, that is, the operation at the time of recording data from the host computer is as shown in FIG.

FIG. 4 is a flow chart showing the main processing flow during data recording in the magneto-optical disk device of the present invention. In the figure, # 11 to # 18 indicate steps.

When a data write command is issued from the host computer, the flow of FIG. 4 starts. In step # 11, the data sent from the host computer is recorded on the disc. If an error occurs during this recording operation (step # 12), the next step # 13
Check if it is an error related to replacement processing.

If it is not an error relating to the replacement processing, the process proceeds to step # 14, and the flow of FIG. 4 is terminated due to the error. On the other hand, if the error is related to the replacement process, the process proceeds to step # 15 to execute the replacement process.

In step # 16, it is monitored whether or not the data write to the final sector is completed. If it is not the final sector, the process returns to step # 11 again.
Perform similar processing. When it is detected in step # 16 that the data write to the last sector is completed, the process proceeds to step # 17.

That is, after the recording of the data requested by the host computer is completed, the process of step # 17 is performed to register the SDL area of FIG. 2, that is, the subsequent defective address generated at the time of recording on the disc. SDL
The address of the defective sector and the address of the sector in which the sector is replaced are recorded in the (Secondary Defect List) area. In step # 18, the error code and the sector address (defective sector address) where the error occurred are recorded in the reserved area Reserved (reserved sector) shown in FIG. 2, and the flow of FIG. 4 is terminated.

By the processing of steps # 11 to # 18 described above, the replacement processing corresponding to the error occurring at the time of data recording is executed, and the address of the defective sector, the information of the address of the sector where the sector is replaced, and the error The code and the address information of the sector in which the error occurred are recorded in the definition zone on the disc.

[0045]

Third Embodiment Next, a third embodiment of the magneto-optical disk device of the present invention will be described in detail. This example
It is related to the invention of claim 3. More specifically, this embodiment provides the error content and the error by providing an error management table for recording the error content causing the replacement process and the replacement address in the invention of claim 2 above. The address is managed more reliably.

The structure of the magneto-optical disk device is the same as that shown in FIG. 1, and the RAM 13 in the control section 1 is provided with an error management table for recording the error content and its replacement address, and the defective sector of the defective sector is recorded. Manage addresses. In the flow of FIG. 4 described above, when the replacement process is performed (step # 15), an error management table is provided in the RAM 13 in the control unit 1 provided in the disk device of FIG. The replacement address of the sector in which the error occurred is recorded.

FIG. 5 is a diagram showing an embodiment of an error management table in the magneto-optical disk device of the present invention.
In the figure, A1 and A2 respectively indicate addresses of defective sectors.

As shown in FIG. 5, the information regarding each replacement process is composed of 4 bytes, and includes an error code (1 byte), a track number of an address where an error has occurred (2 bytes), and an error. The sector number (1 byte) of the address can be recorded. In FIG. 5, only the addresses A1 and A2 of the defective sector are shown in detail, but the others are the same.

[0049]

As described above, certifying one medium requires about 30 minutes. However, according to the first aspect of the present invention, the defective address peculiar to the medium can be registered in the DPL of the medium without performing the certification. Therefore, the speedup of the format (certify) process is realized, and It is possible to effectively use the information on the defective address found by the disk inspection device.

The replacement process may be difficult to reproduce because its frequency of occurrence differs depending on the environment such as ambient temperature and humidity and vibration. That is, it may be unclear why the replacement has occurred, and when it cannot be reproduced, it is difficult to analyze the cause of the replacement. According to the second aspect of the present invention, since the error content causing the replacement is recorded on the medium (disk), it becomes easy to investigate the cause of the replacement.

In the third aspect of the invention, the disk device has an error management table in the RAM 13 in the control unit 1, and the error code indicating the error content and the replacement address of the sector in which the error has occurred are stored. Since it is recorded, the address of the defective sector can be managed.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a main part configuration of a magneto-optical disk device according to the present invention.

FIG. 2 is a conceptual diagram of a disk showing an embodiment of a layout on the disk and a usage state in the magneto-optical disk device of the present invention.

FIG. 3 is a flowchart showing a main processing flow during formatting in the magneto-optical disk device of the present invention.

FIG. 4 is a flowchart showing a main processing flow during data recording in the magneto-optical disk device of the present invention.

FIG. 5 is a diagram showing an embodiment of an error management table in the magneto-optical disk device of the present invention.

FIG. 6 is a diagram showing a disk layout for explaining an example of a conventional disk defect management system.

FIG. 7 is a diagram illustrating an example of a conventional disk defect management method during data writing.

[Explanation of symbols]

 1 control unit 11 CPU 12 ROM 13 RAM 14 data buffer 15 SCSI controller 2 disk control unit 3 disk 4 SCSI bus

Claims (3)

[Claims] 1. In a magneto-optical disk device having a defective sector replacement processing function, defective address reading means for reading a defective address on the disk found by a disk inspection device, and a zone provided at an end portion on the disk. A disk having a defective address registration area therein, and a recording means for recording address information in the first defective address registration area, and the defective address read by the defective address reading means at the time of formatting A magneto-optical disk device, wherein data is recorded in a defective address registration area in a zone on the disk. 2. A magneto-optical disk apparatus having a defective sector replacement processing function, which has a registration area for the error content and the replacement address of the replacement processing in a zone provided at the end of the disk. A disc and a recording means for recording information in the registration area of the error content that has caused the replacement process and its replacement address are provided. When the replacement process occurs during recording on the disc, the replacement process is generated. A magneto-optical disk device, characterized in that the error content and its replacement address are recorded in a registration area in a zone on the disk. 3. The magneto-optical disk device according to claim 2, further comprising an error management table for recording the error content that caused the replacement process and the address of the defective sector.