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4.3 Format Commands
C141-C013 239
4.3.3 READ DEFECT DATA (37)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'37'
1 0 0 0 0 0 0 0 0
2 0 0 0 PList GList Defect List Format
3 0 0 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 0 0 0 0 0 0 0 0
6 0 0 0 0 0 0 0 0
7 Transfer Byte Length (MSB)
8 Transfer Byte Length (LSB)
9 0 0 0 0 0 0 0 0
This command transfers the list described in the defect position information of the
disk media (defect data) to the INIT.
There are two types of defect data, the P List (primary defect list) and the G list (grown
defect list). The P List indicates the defect position information at the time the disk
drive was shipped from the factory. On the other hand, the G List shows the defect
position information specified from the INIT by the REASSIGN BLOCKS command
or automatic alternate block allocation processing, or when executing the FORMAT
UNIT command, or defective data block positional information from alternate block
allocation from Verify operation after initialization.
The INIT can specify the defect data type transferred to the INIT by the "P List
(primary list)" bit and "G List (grown list)" bit in the CDB and can specify the
defect data format by the "Defect List Format" field.
Table 4.42 Defect data type
PList GList Defect Data Type
1 1 P List and G List
1 0 P List only
0 1 G List only
0 0 4-byte header information only (described in this section)