Host Interface

4.4.2 Defect sector management

Sector mapping is executed based on the ISO/IEC 10090 standard for 128 MB media, the ISO/IEC 13963 standard for 230 MB media, the ISO/IEC 15041 standard for 540 and 640 MB media, and GIGAMO 1.3 GB 90 mm Magneto- optical Disk System-System Description for 1.3 GB media. Basically, possibly defective sector management is not required for the host.

Defective sectors cannot be deleted from the host, except for certifying recordable areas. Recordable areas can be certified with the FORMAT UNIT command.

4.4.3 Automatic alternate sector assignment function

The ODD automatically assigns an alternate sector if a verify error is detected in the ID or data section during the WRITE (I0) command, WRITE (12) command, or WRITE AND VERIFY and ERASE command. Alternate sector information is registered in SDL (Secondary Defect List) on media.

After automatic alternate assignment terminates successfully, the ODD does not report any error.

For the criteria for executing alternate sector assignment processing, see Table 4.14, "Alternate sector assignment criteria."

Table 4.14 Alternate sector assignment criteria

Processing

Alternate sector assignment

Remarks

 

processing

 

 

 

 

ID read error

128/230 MB media: 3 read errors in

-

 

3 sectors

 

 

540/640 MB or 1.3 GB media: 2

 

 

read errors in 2 sectors

 

 

 

 

Data error

5 or more bytes per interleave

Verify Check is not performed unless it

 

 

is valid.

 

 

This criterion is inapplicable to the

 

 

ERASE command.

 

 

 

4-14

C156-E227-01EN

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Fujitsu MCM3064AP, MCM3130AP manual Defect sector management, Automatic alternate sector assignment function