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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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