User Manual

SCSI Commands Reference Manual, Rev. J 161
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.24.2 READ DEFECT DATA (10) parameter data
The READ DEFECT DATA (10) parameter data (see table 127) contains a four-byte header, followed by zero or more address descriptors.
PLISTV (PLIST valid) bit
0 A PLIST valid (PLISTV) bit set to zero indicates that the data returned does not contain the PLIST.
1 A PLISTV bit set to one indicates that the data returned contains the PLIST.
GLISTV (GLIST valid) bit
0 A GLIST valid (GLISTV) bit set to zero indicates that the data returned does not contain the GLIST.
1 A GLISTV bit set to one indicates that the data returned contains the GLIST.
DEFECT LIST FORMAT field
The DEFECT LIST FORMAT field indicates the format of the address descriptors returned by the device server. This field is defined in the FORMAT
UNIT command
(see 3.3.5).
If the device server returns short block format address descriptors or long block format address descriptors, the address
descriptors contain vendor-specific values.
NOTE The use of the short block format and the long block format is not recommended for this command.
There is no standard model that defines the meaning of the block address of a defect. In the usual
case, a defect that has been reassigned no longer has an LBA.
If the device server returns physical sector format address descriptors (see 3.3.5.7), it may or may not include defects in parts of
the medium not accessible to the application client. If the device server returns bytes from index format address descriptors (see
3.3.5.6), it shall return a complete list of the defects. A complete list of the defects may include defects in areas not within the
capacity returned in the READ CAPACITY command.
DEFECT LIST LENGTH field
The DEFECT LIST LENGTH field indicates the length in bytes of the address descriptors that follow. The DEFECT LIST LENGTH is equal to four or
eight times the number of the address descriptors, depending on the format of the returned address descriptors.
The address descriptors may or may not be sent in ascending order.
Table 127 READ DEFECT DATA (10) parameter data
Bit
Byte
7 6 5 4 3 2 1 0
0
Reserved
1
Reserved PLISTV GLISTV DEFECT LIST FORMAT
2
(MSB)
DEFECT LIST LENGTH (N - 3)
3
(LSB)
Defect List (if any)
4
ADDRESS DESCRIPTOR(S) (IF ANY)
. . .
n