5.43VERIFY 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 5-205respectively.

Table 5-204VERIFY Command Descriptor Block-Data Format

Bit

7

6

5

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Operation

Code (2Fh)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Reserved

 

DPO

 

Reserved

 

BytChk

RelAdr

 

 

 

 

 

 

 

 

 

 

2 - 5

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

7 - 8

 

 

 

Verification Length

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 5-205VERIFY Command-Field Descriptions

 

 

Field

Description

 

 

 

Disable Page Out. When the value of the field = 1, the device server will assign the logical

DPO

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.

 

 

 

Byte Check. When the value is 1, the drive performs a byte-by-byte comparison of the data

BytChk

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

The address of the first logical sector to be verified.

Block

Address

 

Verifica-

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

tion Length

logical sector space.

 

 

 

Maxtor Atlas 10K V

5-147