Set Features command. Seagate ST10000VN0004, ST10000NE0004, IronWolf

02

H

03

H

10

H

55

H

82

H

90

H

AA

H

F1

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 8 Set Features command values

Enable write cache (default).

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

Sector Count register values:

0A

H

0B

H

0C

H

20

H

21

H

22

H

00

H

01

H

08

H

09

H

Set PIO mode to default (PIO mode 2).

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

PIO mode 0

PIO mode 1

PIO mode 2

PIO mode 3

PIO mode 4 (default)

Multiword DMA mode 0

Multiword DMA mode 1

Multiword DMA mode 2

40

H

41

H

42

H

Ultra DMA mode 0

Ultra DMA mode 1

Ultra DMA mode 2

43

H

44

H

Ultra DMA mode 3

Ultra DMA mode 4

45

H

46

H

Ultra DMA mode 5

Ultra DMA mode 6

Enable use of SATA features

Disable read look-ahead (read cache) feature.

Disable write cache

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 IronWolf Serial ATA Product Manual, Rev. B 28