3.4.8
Seek
(6)
command (0B
H
)
When the drive receives the Seek command, it seeks to the track of the
specified logical block address. This command is not necessary
because
all commands that access the disc contain implied seeks. In systems that
support disconnection, the drive disconnects when it receives a valid
Seek command.
Note. The Seek (6) command cannot access all logical blocks on the
drive. The Seek (10) command must be used to access all logical
blocks.
Bytes
Bits
7
6
5
4
3
2
1
0
0
0
0
0
0
1
0
1
1
1
LUN
Logical block address (MSB)
2
Logical block address
3
Logical block address (LSB)
4
0
0
0
0
0
0
0
0
5
0
0
0
0
0
0
0
0
Bytes 1–3
The
logical block address specifies the logical block to
which the head seeks.
3.4.9
Inquiry command (12
H
)
When the drive receives the Inquiry command, it sends the inquiry data
to the initiator. When the requested inquiry data cannot be returned, a
check condition status is reported.
If an Inquiry command is received from an initiator with a pending
unit-attention condition (before the drive reports a check condition
status), the drive performs the Inquiry command and the Unit Attention
condition is not cleared.
The initiator should allocate 36
H
bytes for inquiry data. The inquiry data
returned to the initiator is summarized in Appendix D on page 117.
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