Seagate (ST2000VX015) - Инструкция по эксплуатации - Страница 30

Seagate SkyHawk Product Manual, Rev. A

29  

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SATA Interface

4.3.2 Set Features command

This command controls the implementation of various features that the drive suppor ts. When the drive receives this
command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value in the
register does not represent a feature that the drive supports, the command is aborted. Power-on default has the read look-
ahead and write caching features enabled. The acceptable values for the Features register are defined as follows:

Table 9

Set Features command

02

H

Enable write cache 

(default)

03

H

Set transfer mode (based on value in Sector Count register)
Sector Count register values:

00

H

Set PIO mode to default (PIO mode 2)

01

H

Set PIO mode to default and disable IORDY (PIO mode 2)

08

H

PIO mode 0

09

H

PIO mode 1

0A

H

PIO mode 2 

0B

H

PIO mode 3

0C

H

PIO mode 4 

(default)

20

H

Multiword DMA mode 0

21

H

Multiword DMA mode 1

22

H

Multiword DMA mode 2

40

H

Ultra DMA mode 0

41

H

Ultra DMA mode 1

42

H

Ultra DMA mode 2

43

H

Ultra DMA mode 3

44

H

Ultra DMA mode 4

45

H

Ultra DMA mode 5

46

H

Ultra DMA mode 6

06

H

Enable the PUIS feature set

07

H

PUIS feature set device spin-up

10

H

Enable use of SATA features

55

H

Disable read look-ahead (read cache) feature

82

H

Disable write cache

86

H

Disable the PUIS feature set

90

H

Disable use of SATA features

AA

H

Enable read look-ahead (read cache) feature 

(default)

F1

H

Report full capacity available

Note

At power-on, or after a hardware or software reset, the 
default values of the features are as indicated above.