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Host Interface
4-14 C156-E205-01EN
"
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.
!
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.
4.4.4 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, or WRITE AND
VERIFY and ERASE command. Alternate sector information is registered in
SDL (Secondary Defect List) on media.