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4.3 Format Commands
C141-C013 225
(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 HDD registers this
defect information on the disk media as the G List.
c. 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 HDD itself. The P List is not included in this defect list. The
HDD 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
− 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 HDD when
automatic allocation processing of alternate blocks is permitted.