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SCSI Commands: 23BMODE SENSE
3.11.1.3
3.11.1.4
MODE SENSE(10) Command Descriptor Block
Bits
Byte
7
0
1
Ignored LUN
2
PC
3
4
5
6
7
(MSB)
8
9
MODE SENSE(10)Field Descriptions
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
DBD
1
3
PC
2
6-7
Page
2
0-5
Code
6
5
4
Operation Code (5Ah)
Rsvd
Reserved
Reserved
Reserved
Reserved
Allocation Length
Control
Description
The Operation Code for MODE SENSE(10) is 5Ah.
The LUN field is vestigial from the SCSI-1 standard and is ignored.
0 = Return the block descriptor in the MODE SENSE data.
1 = Disable Block Descriptors (DBD).
NOTE: When the DBD is 1, the Block Descriptor Length in the
parameter header is 0.
Page Control specifies the type of values to be returned.
00b = Report current values.
01b = Report changeable values. Any bit that can be changed by
MODE SELECT is set to 1; otherwise, the bits are set to 0.
10b = Report default values. Returns the power-up, or reset, values.
11b = Report saved values. Returns the power-up, or reset, values.
76b = Unit
The Page Code selects the page or pages to be returned by the
drive.
00h = Return only the Parameter List Header/Block Descriptor
02h = Return the Disconnect/Reconnect Page
0Ah = Return the Control Mode Page
0Fh = Return the Data Compression Control Page
10h = Return the Device Configuration Page
18h = Return the Protocol Specific Logical Unit Mode Page (FC or
SAS drives only)
19h = Return the Protocol Specific Port Mode Page (FC or SAS
drives only)
1Ch = Return the Information Exceptions Page
1Dh = Return the Medium Configuration Page
21h = Return the Drive Capabilities Page
22h = Return the Interface Control Page
3Fh = Return all available pages in ascending order starting from
page 02h
3
2
1
DBD
Reserved
Page Code
Page 108
0
(LSB)
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