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8.8 MODE SENSE (6) (1A)
LINK
FLAG
Reserved = 0
VU = 0
5
Allocation Length
4
Subpage Code
3
Page Code
PCF
2
Reserved = 0
DBD
RSVD
Reserved
1
Command Code = 1Ah
0
0
1
2
3
4
5
6
7
Bit
Byte
Figure 80. MODE SENSE (1A)
The MODE SENSE (1A) command provides a means for the drive to report various device parameters to
the initiator. It is the complement to the MODE SELECT command.
If the DBD (Disable Block Descriptor) bit is zero, the drive will return the Block Descriptor. If the DBD bit is
set to 1, the drive will not return the Block Descriptor.
Allocation Length indicates the maximum number of bytes which the initiator has set aside for the DATA
IN phase. A value of zero is not considered an error. If the allocation length is smaller than the amount
available, that portion of the data up to the allocation length will be sent. This may result in only a portion
of a multi-byte field being sent.
Page Control Field: PCF (Page Control Field) defines the type of Page Parameter values to be returned.
PCF Meaning
0 0
Report current values. The drive returns the current values under which the logical unit is pre-
sently configured for the page code specified. The current values returned are
1. The parameters set in the last successful MODE SELECT command.
2. The saved values if a MODE SELECT command has not been executed since the last
power-on, hard RESET condition, or TARGET RESET message.
Note: The drive will not process the Mode Select command until the completion of spin-up.
Therefore the initiator cannot modify the current values prior to the saved values being read in.
0 1
Report changeable value. The drive returns the changeable values for the page code specified.
The page requested is returned containing information that indicates which fields are changeable.
All bits of parameters that are changeable shall be set to one. Parameters that are defined by the
drive shall be set to zero. If any part of a field is changeable, all bits in that field shall be set to
one.
Note: For a value field such as the buffer ratios of page 2 the bit field will not indicate the range of
supported values but rather that the field is supported.
1 0 Report default value. The drive returns the default values for the page code specified. The para-
meters not supported by the drive are set to zero.
Ultrastar 146Z10 hard disk drive specifications
80
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