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4.1 Control/Sense Commands
Table 4.17 MODE SENSE command (group 0) parameter configuration (2/2)
Sub Page Descriptor
Bit
Byte
7 6 5 4 3 2 1 0
0 PS SPF Page Code
1 Sub Page Code
2
3
Page Length
4
n
~
~
~
~
~
~
Parameter Field
Page
Heade
r
(1) Header
a. Sense data length
This field indicates the length (number of bytes) of the parameter list (MODE
SENSE data) which it is possible to transfer to the INIT by this command.
The length of the "Sense data length" field itself is not included in this value.
Also, a value for a portion of data with a length that is supported by the HDD
is reported in this field for a parameter list of the type specified in the CDB
regardless of the specification of the "Transfer byte length" field in the CDB.
In order for the INIT to confirm that all the parameter list requested in the
command has been transferred, it should check whether the value which has
the length of the "Sense data length" field itself added to the value indicated
in this field is less than the value specified in the "Transfer byte length" field.
b. Media type
X '00' (default type) is always reported in this field.
c. WP bit
When this bit is "1," it indicates that a write operation to the disk media is
prohibited and when "0" is specified, it indicates that a write operation is
permitted.
d. DPOFUA bit
When this bit is "0," it indicates that the HDD does not support the DPO and
FUA bit. When this bit is "1," it indicates that the HDD supports the DPO
and FUA bits.
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