Host Interface
∀UNIT ATTENTION is not generated.
∀The contents set with the MODE SELECT and Set Feature commands remain unchanged.
4.4.2 Signature
The ODD specifies the following as signatures that indicate the support of the PACKET command function in the task file.
Sector Count = 01h
Sector Number = 01h
Cylinder Low = 14h
Cylinder High = EBh
Drive/Head = 00h or 10h
The ODD sets signatures in the task file when any of the following occurs.
!
!
!
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!
!
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Power on reset
Hardware reset
Software reset
Reception of Device Reset command
Reception of Execute Device Diagnostic command
Reception of Identify Device command (command code ECh)
Reception of Read Sector(s) command (command code 20h)
When the Device Reset command, the Identify Device command, or the Read Sector(s) command is received, the DEV bit is not changed.
4.4.3 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 Cherry Book for 1.3 GB media, the Cherry Book 2 for 2.3GB 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.
4.4.4Automatic 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, or WRITE AND VERIFY and ERASE command. Alternate sector information is registered in SDL (Secondary Defect List) on media.
