Verify
The VERIFY command requests
that
the
Target verify
the
data
written on
the
media.
Verify Command
Descriptor
Block
(COB)
Bit
Byte
7
-I
6
I
5
I
4
1
3
I
2
I
1
I
0
00
Opcode
= 2FH
01 Logical Unit Number
I
DPO=O I
Reserved
1
BYTCK
I ReIAdr=O
02-05
(MSB=02)
Logical Block Address
(LSB=05)
06
Reserved
07-08
(MSB=07)
Verification
Length
(LSB=08)
09
Control
Byte
BYTCK
(Byte Check).
If
the
BYTCK bit
is
set to zero (0), a media verification is performed
with no
data
comparison.
IT
BYTCK
is
set
to
one (1), the drive will request
data
from
the
Initiator and do a byte-by-byte comparison of this
data
with
the
data
read from
the
media.
If
the
data
does
not
compare with
that
on
the
media, a Status of CHECK CONDITION will
be returned.
The
Sense Key will be set
to
MISCOMPARE with a Sense Code
of
COMPARE
ERROR.
If
the
data
cannot be read from
the
media, a MEDIUM
ERROR
will
be
returned.
Logical Block Address. This field specifies
the
logical block
at
which
the
VERIFY operation
will begin.
Verification Length. This field specifies
the
number of contiguous logical blocks of
data
that
will be verified. A length of zero indicates
that
no logical blocks will be verified. This
condition is
not
considered an error. Any other value indicates
the
number oflogical blocks
that
will be verified.
If
the BYTCK
bit
is set to one (1),
the
total
number of bytes
to
be
verified must
not
exceed 32,768 or the following will be returned:
Status: CHECK CONDITION
Sense
Key: ILLEGAL REQUEST
Sense Code:
ILLEGAL FIELD IN COB.
A-56 SCSI Command Descriptions DRAFT
1/18/93 09:58
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