Seagate (ST12000NE0008) - Инструкция по эксплуатации - Страница 46

Seagate IronWolf Pro SATA Product Manual, Rev. G

45 

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Serial ATA (SATA) interface

4.3.4

Set Features command

This command controls the implementation of various features that the drive supports. 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:

NOTE

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

Table 11

Set Features command values

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

10

H

Enable use of SATA features

55

H

Disable read look-ahead (read cache) feature.

82

H

Disable write cache

90

H

Disable use of SATA features

AA

H

Enable read look-ahead (read cache) feature 

(default).

F1

H

Report full capacity available