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214 Fibre Channel Interface Manual, Rev. D
Mode Sense Page Headers and Their Parameters
See Table 144.
Number of Blocks
The number of logical blocks of the medium that meets the Block Length in the Block Descriptor.
0 All of the remaining logical blocks of the logical unit have the medium characteristics specified by the Block Descrip-
tor.
Sense Data Length
The length (in bytes) of the following 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.
Mode Sense page descriptor header
Field definitions (listed alphabetically)
Mode Parameters
The contents of the mode pages being transferred. The number of bytes is indicated in the Page Length field.
Page Code
Each page of mode parameters (for the Mode Sense command) begins with a two-byte Page Descriptor Header. The Page
Code identifies the page of mode parameters that is being transferred (see Table 145). The parameter bit values are left
blank herein, because they may be different for each drive model.
Note. See the individual drive’s Product Manual, Volume 1, for a table giving the Mode Sense parameter values that are
applicable to the disc drive model of interest. The tables in Volume 1 also show which parameters are changeable
in the drive model of interest and which are not.
Multiple pages of mode parameters may be transferred in one Mode Sense Data In phase (using Page Code 3Fh). If a non-
supported page code is requested by the Initiator, the disc drive terminates the command with Check Condition status, sets
the sense key to 05, Illegal Request, and sets the additional sense code to 24, Invalid Field In Parameter List.
Table 144: Mode Sense page descriptor header
Bit
Byte
76543210
0 PS 0 Page Code
1
Page Length
2–n
Mode Parameters
143
143
143
143
Table
number
144
144