Section 5 SCSI Programming Guidelines
5.11.13.2 MODE SENSE Data
Table 5-28 MODE
SENSE
Data
Bit 7
6
5
4
3
2
1 o
Byte
0 SENSE
DATA
LENGTH
I
MEDIUM
TYPE = 0
2
WP=O
I
RESERVED
=0
3
BLOCK
DESCRIPTOR LENGTH = 8
Block Descriptor
0 DENSITY CODE = 00
1-3
(MSB)
NUMBER OF BLOCKS = 0
(LSB)
4
RESERVED
=0
5-7
(MSB)
BLOCK LENGTH
(LSB)
Page Descriptors
0
PS
J
R=O
I
PAGE
CODE
1
PAGE
LENGTH
2
to
n
REFER
TO
PAGE
DEFINITION
AND
SECTION 5.11.10
SENSE DATA LENGTH (Byte 0) - Specifies the length in bytes
of
the following MODE
SENSE data that is available to be transferred during the DATA IN phase. The SENSE DATA length
does not include itself.
WP
- WRITE PROTECTED (Byte 2, Bit 7) - Always set to zero for the ProDrive,
indicating that the drive is write enabled.
BLOCK DESCRIPTOR LENGTH (Byte 3) - Specifies the length in bytes
of
all the block
descriptors. It is set to eight for the
ProDrive.
BLOCK DESCRIPTORS: The block descriptor specifies the medium characteristics for the drive
with a density code, number
of
blocks, and block length. These characteristics have the same
meanings as the corresponding fields in the
MODE SELECT parameter list (Section 5.11.10.2).
PAGE
DESCRIPTORS:
PS
- PARAMETERS
SA
VEABLE (Byte
0,
Bit 7) - Set to zero in each page header
indicates that the supported parameters
of
that page cannot be saved by the ProDrive. A PS bit set
to one indicates that the supported parameters
of
the page can be saved by the ProDrive. All pages
with parameters that can be changed by the user can be saved on the
ProDrive.
5·56
SCSI
Programming
Guidelines
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