Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Verify (Group 1) Command (2FH)
Chapter 22-92
Verify (Group 1) Command (2FH)
This command verifies previously written data integrity starting at the
specified Logical Block Address by reading the data and checking the
Error Correction Code. The verification threshold is set to approximately
half of the error correction capability.
DPO A Disable Page Out (DPO) bit of 1 instructs the target
not to retain the data in the cache after it has been
verified.
A DPO bit of 0 instructs the target to retain the data in
the cache after it has been verified.
This bit is ignored.
Table 2-80 Verify (Group 1) Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (2FH)
1 Logical Unit
Number (0)
DPO Rsvd
(0)
Blk
Vfy
Rsvd
(0)
RelAdr
2 Logical Block Address (MSByte)
3 Logical Block Address
4 Logical Block Address
5 Logical Block Address (LSByte)
6 Reserved (0)
7 Verification Length (MSByte)
8 Verification Length (LSByte)
9 Reserved (0) Flag Link