Section 5 SCSI Programming Guidelines
TRANSFER LENGTH (Bytes 7·8) - Specifies the number
of
contiguous logical blocks
of
data
that will
be
transferred. A transfer length
of
zero indicates that no logical blocks will
be
transferred.
This condition will not be considered an error and no data will be written.
5.11.21
VERIFY COMMAND: OPCODE = 2F(hex)
The VERIFY command (Table 5-37) requests that the target verify the data written on the medium.
TABLE 5-37
VERIFY
Command
Bit
7
I
6
I
5
I
4
I
3
I
2
I
1
I··
0
Byte
0
OPCODE=2FH
1
LUN-O
I
RESERVED=O
I
BYIOiK
Lp,
AnR::()
2-5
(MSB)
LOGICAL
BLOCK ADDRESS
(LSB)
6
RESERVED=O
7-8
(MSB)
VERIACA
nON
LENGTH
(LSB)
9
vu::o
I
RESERVED
=0
I
F
I
L
BYTCHK • BYTE CHECK (Byte
1,
Bit
1)
- Must
be
set to zero. See the explanation
of
B YTCHK in the WRITE AND VERIFY command (Section 5.11.20).
If
this bit is set to one, the
command will be tenninated with a CHECK CONDITION status with the ILLEGAL REQUEST
sense key.
IIOGICAL BLOCK ADDRESS (Bytes
2-S)
- Specifies the logical block at which the verify
operation is to begin.
VERIFICATION LENGTH (Bytes 7·8) - Specifies the number
of
continuous logical blocks
of
data that are to
be
verified. A transfer length
of
zero indicates that no logical blocks are to be verified.
This condition will not be considered an error. Any other value indicates the number
of
logical blocks
to
be
verified.
SCSI
Programming
Guidelines
5·63
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