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C156-E142-02EN 4 - 13
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
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.
4.4.3 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.
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
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Data error Error in five bytes or more per interleaving Not checked if verify check is
disabled. (Except ERASE command)