IBM Ultrastar 36LZX Specifications page 161

Byte
7 6
0 (MSB)
|
3
4
n
Figure 137. REPORT DEVICE IDENTIFIER parameter list
The IDENTIFIER LENGTH field specifies the length in bytes of the IDENTIFIER field. If the
ALLOCATION LENGTH field in the CDB is too small to transfer all of the identifier, the length is not
adjusted to reflect the truncation. The identifier length initially equals zero, and is changed only by a
successful SETDEVICE IDENTIFIER command.
The IDENTIFIER field contains a vendor specific value. The value reported is the last value written by a
successful SET DEVICE IDENTIFIER command. The value of the identifier is changed only by a SET
DEVICE IDENTIFIER command. The identifier value persist through resets, power cycles, media format
operations.
The target return the same Identifier to all initiators on all ports.
The execution of a REPORT DEVICE IDENTIFIER requires the enabling of a nonvolatile memory within
the logical unit. If the nonvolatile memory is not ready, the device server return CHECK CONDITION
status, rather than wait for the device to become ready. The sense key is set to NOT READY and the
additional sense data is set as described in the TEST UNIT READY command. This information should
allow the application client to determine the action required to cause the device server to become ready.
Bit
5 4 3
Identifier Length = n-3
Identifier
Ultrastar 36LZX hard disk drive specifications
2 1 0
(LSB)
161