Set Features command. Seagate ST4000VXZ07/VX007

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SATA Interface

82

H

86

H

90

H

AA

H

F1

H

06

H

07

H

10

H

55

H

4.3.2 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:

Table 14 Set Features commands

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

Enable the PUIS feature set

PUIS feature set device spin-up

Enable use of SATA features

Disable read look-ahead (read cache) feature

Disable write cache

Disable the PUIS feature set

Disable use of SATA features

Enable read look-ahead (read cache) feature (default).

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.

Seagate SkyHawk Product Manual, Rev. L 38