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Command Specifications
236 C141-C013
The format of the "Defect Data" list transferred from the INIT by this command is
shown in Table 4.41.
Table 4.41 REASSIGN BLOCK command: defect data list configuration
Bit
Byte
7 6 5 4 3 2 1 0
0 X'00'
1 X'00'
2 Defect List Length (m) (MSB)
3 Defect List Length (m) (LSB)
4 Defective Block Logical Block Address (MSB)
5 Defective Block Logical Block Address
6 Defective Block Logical Block Address
7 Defective Block Logical Block Address (LSB)
8
Defective Block Logical Block Address
n+3
The "Defect data" list is configured from a 4-byte header and one or more defect
descriptors which follow it. One defect descriptor has a length of 4 bytes.
The "Defect list length" field in the header indicates the total number of bytes (m)
of the defect descriptor list transferred after the header, and must be a multiple of
4. Also, when zero is specified in this field, this command is terminated without
transfer of the defect descriptor list and allocation processing of alternate blocks.
The Defect list length that can be specified for the HDD is 2,044
(X '7FC') bytes or less. Therefore, a maximum of 511 defective
blocks can be specified in the REASSIGN BLOCKS command.
The logical block address of defective data blocks is described in 4-byte format in
the defect descriptor. When multiple defect descriptors are specified, it is best for
the INIT to describe defect descriptors in the ascending order of the logical data
block addresses.
Furthermore, if the addresses of logical data blocks specified in the defect descriptor
list overlap each other, This command is terminated with a CHECK CONDITION
status (ILLEGAL REQUEST [=5] / Invalid field in parameter list [=26-00] and none
of the alternate block allocation processing in that command is executed.
~
~
Header
Defect
Descriptor
List
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~
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~