CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5 . 2 •
35.
VERIFY
Command
==============================================================================
Bitl
Byte
l
7
6
5
4
3
2 1
o
==============================================================================
o I Opera
tion
Code (2Fh) :
-----\-----------------------------------------------------------------------\
1 :
Logical
Unit
Number :
Reserved
:
-----:-----------------------------------------------------------------------\
2 :
(MSB)
:
-----1--- ---I
, I
I I
3
-----\---
Logical
Block
Address
---l
4 ' 1
5
---I
(LSB) :
-----------------------------------------------------------------------,
6
7
(MSB)
8
,
I
Reserved
Verification
Length
(LSB)
-----\-----------------------------------------------------------------------
9 \
Control
Byte
==============================================================================
111e
VERIFY
command
requests
that
the
controller
·w'e.rify
the
data
en
the
disc
based
on
the
error
recovery
parameter
settings.
This
command
operates
the
same
as
a
READ
EXTS~DED
command
except
the
data
is
not
transferred
to
the
initiator.
The
verification
is
performed
according
to
the
settings
of
the
verification
page
(See
Section
5.3.1.3.)
The
logical
block
address
specifies
the
logical
block
at
which
the
verify
operation
will
begin.
The
verification
length
specifies
the
number
of
contiguous
logical
blocks
of
data
that
will
be
verified.
A
verification
length
of
zero
indicates
that
no
logical
blocks
will
be
verified
but
the
addressed
drive
will
perform
a
seek
operation
to
the
specified
address..
This
condition
will
not
be
considered"
as
an
error.
Any
other
value
indicates
the
number
of
logical
blocks
that
will
be
verified.
See
the
READ
command
for
exception
handling
description.
5-62
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