Report Device Identifier Command (A3H); Table 5-159 Report Device Identifier Command Descriptor Block-Data Format; Table 5-160 Report Device Identifier Command Descriptor Block-Field Descriptions; Table 5-161 Report Device Identifier Parameter List-Data Format - Maxtor ATLAS 10K IV User Manual

SCSI Description
5.31

REPORT DEVICE IDENTIFIER Command (A3h)

The REPORT DEVICE IDENTIFIER command requests that the device server send
device identification to the application client. The data format and field descriptions
are shown in Table 5-159 and Table 5-160 respectively.
REPORT DEVICE IDENTIFIER Command Descriptor Block-Data Format
Table 5-159
Bit
7
Byte
0
1
2 – 5
6 – 9
10
11
REPORT DEVICE IDENTIFIER Command Descriptor Block-Field Descriptions
Table 5-160
Field
Service Action
Allocation Length
The REPORT DEVICE IDENTIFIER command's parameter list contains a 4-byte
field that provides the length, in bytes, of the parameter list and the logical unit's
identifier. The data format and field descriptions are shown in Table 5-161 and Table
5-162 respectively.
Table 5-161
Bit
Byte
(MSB)
0 – 3
4 – n
REPORT DEVICE IDENTIFIER Parameter List-Field Descriptions
Table 5-162
Field
Identifier Length
Identifier
5-106 Maxtor Atlas 10K IV
6 5
Reserved
Must = 05h. Any other value forces Check Condition, Illegal Request.
If the length is not sufficient to contain all of the parameter data, the first
portion of the data is returned, and this is not considered to be an error.
The actual length of the parameter data is available in the Identifier
Length field in the parameter data. If the remainder of the parameter data
is required, the application client must send a new REPORT DEVICE
IDENTIFIER command with an Allocation Length field large enough to
contain all of the data.
REPORT DEVICE IDENTIFIER Parameter List-Data Format
7 6 5
This field specifies the length, in bytes, of the Identifier field. If the Al-
location Length field in the CDB is insufficient in size to transfer all of
the Identifier, the length is not adjusted to reflect any truncation of infor-
mation. The Identifier is initially set = 0, and is changed only by a suc-
cessful SET DEVICE IDENTIFIER command.
The value reported in this field is a vendor-specific value and is the last
value written by a successful SET DEVICE IDENTIFIER command.
The value of the Identifier is changed only by a successful SET DEVICE
IDENTIFIER command. The Identifier value persists through device re-
sets, power cycles, and formatting of media.
4 3
Operation Code (A3h)
Service Action (05h)
Reserved
(MSB)
Allocation Length
(LSB)
Reserved
Control
Description
4 3
Identifier Length (n – 4)
Identifier
Description
2 1 0
2 1 0
(LSB)