4.4.2Defect 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 the GIGAMO 90 mm Magneto-optical Disk System - System Description standard for 1.3 GB . 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.

4.4.3Automatic 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. Table 4.15 lists criteria used to execute alternate sector assignment.

Table 4.15 Alternate sector assignment criteria

Process

Alternate sector assignment criteria

Remarks

 

 

 

ID read error

128 MB/230 MB media:

-

 

3 read errors in 3 sectors

 

 

540 MB/640 MB/1.3 GB media:

 

 

2 read errors in 2 sectors

 

 

 

 

Data error

Error in five bytes or more per interleaving

Not checked if verify check is

 

 

disabled. (Except ERASE command)

 

 

 

C156-E142-02EN

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Fujitsu MCF3064AP, MCE3064AP, MCE3130AP manual Defect sector management, Automatic alternate sector assignment function

MCE3130AP, MCE3064AP, MCF3064AP specifications

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