Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E 131
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For systems which support disconnection, the disc drive disconnects while executing this command.
The Reassign Blocks defect list (Table 5.2.1-8) contains a four byte header followed by one or more Defect
Descriptors. The length of each Defect Descriptor is four bytes.
Table 5.2.1-8. Reassign Blocks Defect List
Defect List Header
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
2
Defect List Length (MSB)
[1]
3
Defect List Length (LSB)
Defect Descriptor(s)
0
Defect Logical Block Address (MSB)
[2]
1
Defect Logical Block Address
2
Defect Logical Block Address
3
Defect Logical Block Address (LSB)
Notes.
[1] The Defect List Length specifies the total length in bytes of the Defect Descriptors that follow. The Defect
List Length is equal to four times the number of Defect Descriptors.
[2] The Defect Descriptor specifies a four byte Defect Logical Block Address that contains the defect. The
Defect Descriptors shall be in ascending order.
If the logical unit has insufficient capacity to reassign all of the defective logical blocks, the command shall
terminate with a Check Condition status and the Sense Key shall be set to HARDWARE ERROR and the
additional sense code set to NO DEFECT SPARE LOCATION AVAILABLE. The logical block address of the
first logical block not reassigned shall be returned in the information bytes of the sense data. If information
about the first defect descriptor not reassigned is not available, or if all the defects have been reassigned, this
field shall be set to FFFFFFFFh.
If the REASSIGN BLOCKS command failed due to an unexpected unrecoverable read error that would
cause the loss of data in a block not specified in the defect list, the logical block address of the unrecoverable
block shall be returned in the information field of the sense data and the valid bit shall be set to one.
IMPLEMENTORS NOTE: If the REASSIGN BLOCKS command returns CHECK CONDITION status and the
sense data command-specific information field contains a valid logical block address, the initiator should
remove all defect descriptors from the defect list prior to the one returned in the command-specific informa-
tion field. If the sense key is MEDIUM ERROR and the valid bit is one (the information field contains the valid
block address) the initiator should insert that new defective logical block address into the defect list and
reissue the REASSIGN BLOCKS command with the new defect list. Otherwise, the initiator should perform
any corrective action indicated by the sense data and then reissue the REASSIGN BLOCKS command with
the new defect list.
