Write
And
Verify
Write
And
Verify
The
WRITE
AND
VERIFY
command requests
the
Target
to
write
the
data
transferred by
the
Initiator
to
the
media, and then verify
the
data
that
was
written.
Write
And
Verify
Command
Descriptor
Block
(COB)
Bit
Byte
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
00
Opcode = 2EH
01
Logical Unit Number
I DPO=O I
Reserved
I
BYTCK I ReIAdr=O
02-05
(MSB=02) Logical Block Address (LSB=05)
06
RESERVED
07-08
(MSB=07)
Transfer
Length
(LSB=08)
09
Control
Byte
BYTCK
(Byte
Cheek).
If
the
BYTCK
bit
is set
to
zero (0),
an
ECC
verification of
the
data
written is performed with no
data
comparison.
If
BYTCK
is
set
to
one (1),
the
drive will do
a byte-by-byte comparison of
the
data
written
to
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
WRITE
AND
VERIFY
operations will begin.
Transfer Length. This field specifies
the
number
of
contiguous logical blocks of
data
to
be
transferred. A Transfer Length
of
zero in.dicates
that
no logical blocks shall
be
transferred.
This condition shall
not
be
considered an error
(it
is functionally equivalent
to
a SEEK
command).
If
the
BYTCK
bit
is set
to
one (1),
the
total
number of bytes
to
be
written
and
verified
must
not exceed 32,768 or
the
following
will
be
returned:
DRAFT
1/18/93 09:58
Status: CHECK CONDITION
Sense Key: ILLEGAL REQUEST
Sense
Code: ILLEGAL FIELD IN CDB
SCSI
Command
Descriptions
A-59
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