Verify Command (2Fh) - Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual

5.45

VERIFY Command (2Fh)

The VERIFY command verifies the data on the medium for the Logical Block
Address range specified.
Bit 7
Byte
0
1
2 - 5
6
7 - 8
9
Figure 5–105 VERIFY Command Descriptor Block — Data Format
Field
DPO
BytChk
RelAdr
Logical Block Address
Verification Length
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
6 5
Operation Code (2Fh)
Reserved
Logical Block Address
Verification Length
Table 5–99 VERIFY Command — Field Descriptions
Description
Disable Page Out. When the value of the field = 1, the device server shall
assign the logical blocks accessed by this command the lowest priority for
being fetched into or retained by the cache.
When DPO = 0, the priority shall be determined by fields in the Caching
page.
Byte Check. When the value is 1, the drive performs a byte-by-byte
comparison of the data on the medium with the data sent by the initiator
in the data-out buffer transfer.
When 0, the drive performs a medium verification with no data
comparison. In this case, no data is sent by the initiator.
Relative Address. This feature is not supported; the field must be 0.
The address of the first logical sector to be verified.
The number of contiguous sectors that are to be verified. The drive returns
a CHECK CONDITION status with the correct sense data if the specified
transfer extends beyond out of the logical sector space.
4 3 2
DPO Reserved
Reserved
Control
SCSI Description
1 0
BytChk RelAdr
5–213