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Command Specifications
4.1.6 MODE SENSE (1A)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'1A'
1 0 0 0 0 DBD 0 0 0
2 PC Page Code
3 Sub Page Code
4 Transfer Byte Length
5 0 0 0 0 0 0 0 0
This command reports the values for each type of parameter related to the disk
drive's physical attributes, data format, timing of SAS interface transferring
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 HDD 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 HDD transfers MODE SENSE
data composed from the "Header" and the specified "Page descriptor" only to INIT.
When "0" is specified in this bit, the HDD 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 HDD and their page codes and lengths are as shown
in Table 4.15.
166 C141-C013