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Command Specifications
Page Descriptor
Bit
Byte
0
Page
Header
1
2
~
~
~
~
n
Figure 3.9
MODE SELECT EXTENDED command (Group 2) parameter configuration
3.1.7
MODE SENSE (1A)
Bit
7
Byte
0
1
2
PC
3
0
4
5
0
This command reports the values for each type of parameter related to the disk drive's physical
attributes, data format, timing for SCSI bus disconnect and reconnect processing, error recovery
procedures, etc., as well as the attributes of those parameters, to the INIT.
The data (MODE SENSE data) transferred to the INIT from the IDD by this command are
configured from a "Header," "Block Descriptor" and one or more "Page descriptors" which describe
each type of parameter, each of which will be described later in this item.
When "1" is specified in the "DBD (disable block descriptors)" bit of CDB byte 1, it indicates that a
"Block descriptor" is not included in the MODE SENSE data transferred to the INIT by this
command and the IDD transfers MODE SENSE data composed from the "Header" and the specified
"Page descriptor" only to INIT. When "0" is specified in this bit, the IDD transfers MODE SENSE
DATA composed of the "Header, " a single "Block descriptor" and the specified "Page descriptor" to
the INIT.
The "Page code" field in CDB byte 2 specifies the page code of the "Page descriptor" transferred to
the INIT by this command. The types of "Page descriptor" supported by the IDD and their page
codes and lengths are as shown below.
3 - 28
7
6
5
0
0
Parameter Field
6
5
LUN
0
0
Transfer Byte Length
0
0
4
3
Page Code
Page Length
4
3
2
X'1A'
0
DBD
0
Page Code
0
0
0
0
0
0
2
1
0
~
~
1
0
0
0
0
0
0
Link
C141-E167
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