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Fibre Channel Interface Manual, Rev. D 247
Field definitions (listed alphabetically)
Block Descriptor Data
See Table 143.
Block Descriptor Length
The length (in bytes) of the block descriptor. It is equal to the number of bytes in the Block Descriptor (8) and does not
include the page headers and mode parameters, if any. The disc drive sends one Block Descriptor.
Each Block Descriptor specifies the medium characteristics for all or part of a logical unit. Each Block Descriptor contains a
Density Code, a Number of Blocks, and a Block Length.
DPO-FUA (Disable Page Out–Force Unit Access)
0 When used with the Mode Sense command, this value indicates that the target does not contain a cache memory or
does not support the DPO and FUA bits.
1 The target supports the DPO and FUA bits.
Medium Type
00h (default medium). This is the only valid value.
Mode Sense Page Headers and Their Parameters
See Table 143.
Sense Data Length
The length (in bytes) of the Mode Sense data that is available to be transferred to the initiator. The Sense Data Length does
not include itself.
WP (Write Protect)
0 The medium is write enabled.
1 The medium is write protected.
Table 161: Mode Sense (10) data
Bit
Byte
76543210
0
(MSB)
Sense Data Length
1
(LSB)
2
00000000
Medium Type
3
WP
00
DPO-FUA
0000
Reserved Reserved
4 Reserved
5 Reserved
6
(MSB) 00000000
Block Descriptor Length (8 decimal)
7
00001000 (LSB)
0–7 Block Descriptor Data (see Table 143)
0–n Mode Sense Page Headers and Their Parameters
Table
number
161
161
161
161
161
161
161