CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.2.
30.
SEEK
Co_and
==============================================================================
Bitl
Byte I
7
6
5
4
3
2
1
o
==============================================================================
o I
Operation
Code
(OBh)
:
-----1-----------------------------------------------------------------------1
1 :
Logical
Unit
Number :
(MSB)
1
-----1------------------------------
---I
2 :
Logical
Block
Address
I
-----1--- ---I
3 I
(LSB)
:
-----1-----------------------------------------------------------------------1
4 I Reserved . I
-----1-----------------------------------------------------------------------:
5 I
Control
Byte
:
==============================================================================
The
SEEK
command
requests
that
the
controller
position
the
optical
pick-up
at
logical
block
address
specified
and
enter
the
hold
track
state
for
the
duration
of
the
inactivity
time.
A
seek
operation
may
be
requested
to
any
logical
block
address
that
is
less
than
or
equal
to
that
reported
by a
READ
CAPACITY
command.
If
the
logical
block
address
is
within
a
data
track
then
the
address
will
be
verified
against
the
header
address.
If
the
logical
block
address
is
within
an
audio
track
it
is
first
converted
into
a Q
sub-ch~-~el
gddress
~~d
the
seek
is
performed
to
that
address.
The Q
sub-channel
address
has
a
tolerance
of
~
75
blocks.
If
the
disconnect
privilege
is
granted
the
controller
will
disconnect
before
performing
the
seek
operation.
If
the
ready
condition
does
not
exist
a
CHECK
CONDITION
status
will
be
returned
and
the
appropriate
additional
sense
code
set.
If
the
logical
block
address
requested
exceeds
that
reported
by
the
READ
CAPACITY
data
a
CHECK
CONDITION
status
will
be
returned.
The
sense
key
is
set
to
ILLEGAL
REQUEST
and
the
additional
sense
code
is
set
to
LOGICAL
BLOCK
ADDRESS
NOT
VALID.
If
the
drive
is
unable
to
complete
the
seek
operation
a
CHECK
CONDITION
status
will
be
returned.
The
sense
key
is
set
to
MEDIUM
ERROR
and
the
additional
sense
code
is
set
to
ERROR
OCCURRED
DURING
SEEK
OPERATION.
5-56
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