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Maxtor Atlas 10K V 5-147
5.43 VERIFY Command (2Fh)
The VERIFY command verifies the data on the medium for the Logical Block
Address range specified. The data format and field descriptions are shown in Table 5-
204 and Table 5-205 respectively.
Table 5-204 VERIFY Command Descriptor Block-Data Format
Table 5-205 VERIFY Command-Field Descriptions
Bit
Byte
765 4 3210
0 Operation Code (2Fh)
1 Reserved DPO Reserved BytChk RelAdr
2 - 5 Logical Block Address
6 Reserved
7 - 8 Verification Length
9 Control
Field Description
DPO
Disable Page Out. When the value of the field = 1, the device server will 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 will be determined by fields in the Caching page.
BytChk
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.
RelAdr Relative Address. This feature is not supported; the field must be 0.
Logical
Block
Address
The address of the first logical sector to be verified.
Verifica-
tion Length
The number of contiguous sectors that are to be verified. The drive returns a CHECK CON-
DITION status with the correct sense data if the specified transfer extends beyond out of the
logical sector space.