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SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–111
5.17 MODE SENSE (10) COMMAND (5Ah)
The MODE SENSE command allows the initiator to read the drive’s sector
descriptor and mode pages.
See Figure 5-47 for MODE SENSE (10) Command Descriptor Block – Data Format,
Figure 5-48 for Mode Parameter Header (10 Byte) — Data Format, and Figure 5-49
for Mode Parameter Block Descriptor – Data Format. Refer to Tables 5-45, 5-46, and
5-51 for descriptions of the fields.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (5Ah)
1 Logical Unit Number
Reserve
d
DBD Reserved
2 – 6 Reserved
7 – 8
(MSB)
Allocation Length
(LSB)
9 Control
Figure 5–47 MODE SENSE (10) Command Descriptor Block – Data Format
Bit
Byte
7 6 5 4 3 2 1 0
0 - 1
(MSB)
Mode Data Length
(LSB)
2 Medium Type
3 Device-Specific Parameter
4 - 5 Reserved
6 - 7 Block Descriptor Length
Figure 5–48 Mode Parameter Header (10 Byte) — Data Format
Field Descriptions for the Mode Parameter Header are given in the table that follows.