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(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
INIT 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.
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.
C141-E054-02EN
the following defect position
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