39 set device identifier command (a4h) – Maxtor 10K V User Manual
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Maxtor Atlas 10K V
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5.39
SET DEVICE IDENTIFIER Command (A4h)
The SET DEVICE IDENTIFIER command requests that the device identifier
information in the logical unit be set to the value send via the SET DEVICE
IDENTIFIER command’s parameter list. The data format and field descriptions are
shown in Table 5-195 and Table 5-196 respectively.
Upon successful completion of a SET DEVICE IDENTIFIER command, a Unit
Attention is generated for all initiators except the one that issued the command.
Table 5-195
SET DEVICE IDENTIFIER Command Descriptor Block-Data Format
Table 5-196
SET DEVICE IDENTIFIER Command Descriptor Block-Field Descriptions
The SET DEVICE IDENTIFIER command’s parameter list contains Identifier to be
set by the logical unit to which the command is sent. The parameter list is shown
below in Table 5-197 and the field descriptions are shown in Table 5-198.
Table 5-197
SET DEVICE IDENTIFIER Parameter List-Data Format
Table 5-198
SET DEVICE IDENTIFIER Parameter List-Field Descriptions
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (A4h)
1
Reserved
Service Action (06h)
2 – 5
Reserved
6 – 9
(MSB)
Parameter List Length
(LSB)
10
Reserved
11
Control
Field
Description
Service Action
Must = 06h. Any other value forces Check Condition, Illegal Request.
Parameter List Length
This field specifies the length, in bytes, of the Identifier to be transferred from the ap-
plication client to the device server. The maximum value for this field is 64 bytes. A
parameter list length of 0 indicates that no data will be transferred, and that subsequent
REPORT DEVICE IDENTIFIER commands will return an Identifier length of 0. If
the parameter list length exceeds 64 bytes, then the drive returns a Check Condition
status with the sense key set to Illegal Request, and an additional sense code of Invalid
Field in CDB.
Bit
Byte
7
6
5
4
3
2
1
0
0 – n
(MSB)
Identifier
(LSB)
Field
Description
Identifier
The value reported in this field is the data to be returned by all subsequent
REPORT DEVICE IDENTIFIER commands, until a new SET DEVICE
IDENTIFIER command is issued that changes the data.