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Command Specifications
3 -
76
C141-E167
(1) Defect list
In order to register or specify the positions of defects on the disk media in connection with defect
management processing that can be specified from the INIT, the following types of “Defect List” are
defined.
a. P List: primary defect list
Defect position information (permanent defects) is registered in this list at the time the disk drive
is shipped from the factory. The P List registers areas on the disk media which clearly cannot be
accessed from the INIT. The INIT can refer to the contents of this list by the READ DEFECT
DATA command only, but cannot change or erase it.
b. D List: data defect list
The defect information in this list is defect position information transferred from the INIT when
this command is executed. The IDD registers this defect information on the disk media as the G
List.
c. C List: target certification list
This defect list contains position information on defective data blocks detected in the data block
verify operation (Certification) after initialization when the FORMAT UNIT command is
executed. The IDD generates this list internally when the FORMAT UNIT command is executed
and adds it to the G List.
d. G List: grown defect list
The defect information in this list contains defect position information specified by the NIT and
position information on defective data blocks detected by the IDD itself. The P List is not
included in this defect list. The IDD stores the G List in an area on the disk media which clearly
cannot be accessed from the INIT. The INIT can refer to the contents of this list by the READ
DEFECT DATA command. the following defect position information is included in the G List.
• Defect information transferred from the INIT as the D List.
• Defect information detected in the Verify operation when this command was executed (C
List)
• Defect information specified from the INIT by the REASSIGN BLOCKS command.
• Defect information on data blocks where alternate block allocation was performed among
defective data blocks detected by the IDD when automatic allocation processing of alternate
blocks is permitted.