5.19READ (10) Command (28h)

The READ (10) command requests that data be transferred from the drive to the initiator. The amount of data transferred is specified by the transfer length field. The starting point is specified by the logical sector address. The data format and field descriptions are shown in Table 5-121 and Table 5-122 respectively.

Table 5-121READ (10) Command-Data Format

Byte

Bit

7

6

5

4

 

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

Operation

Code (28h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

Reserved

 

DPO

 

FUA

 

Reserved

RelAdr

 

 

 

 

 

 

 

 

 

 

 

2 - 5

 

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7 - 8

 

 

 

 

Transfer Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 5-122READ (10) Command-Field Descriptions

 

 

Field

Description

 

 

 

Disable Page Out. When the value is 0, the drive caches the data read, using its normal

DPO

Logical Read Unit policies.

When the value is 1, the drive assigns to logical blocks accessed by the READ (10)

 

 

command the lowest priority for being fetched into or retained by the cache.

 

 

 

Force Unit Access. When the value is 0, the drive is allowed to satisfy the read with

FUA

cache-resident data.

A value of 1 indicates that the drive accesses the media in performing the command

 

 

before returning GOOD status.

 

 

RelAdr

Relative Addressing. The drive does not support relative addressing. Must be 0

 

 

Logical Block Address

Specifies the logical sector address where the read operation will begin.

 

 

 

Specifies the number of contiguous logical blocks of data to transfer. A transfer length

 

of 0 indicates that no logical blocks are to be transferred.

Transfer Length

Any other value indicates the number of logical blocks to be transferred. The drive

 

 

returns a CHECK CONDITION status with the correct sense data if the specified

 

transfer extends beyond the logical sector space.

Maxtor Atlas 10K V

5-93

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Maxtor 10K V manual Read 10 Command 28h, 121READ 10 Command-Data Format, Read 10 Command-Field Descriptions