Set Features (Efh) - Western Digital Purple PR1000M Technical Reference Manual

PR1000M
4.4

Set Features (EFh)

The Set Features command enables or disables the features listed in the following
table.
Enable read look-ahead
Disable read look-ahead
Enable write cache
Disable write cache
Set Transfer Mode
Enable use of Serial ATA Feature
Disable use of Serial ATA Feature
Note: Changes are only valid while power remains applied to the drive. After power is
cycled, the drive reverts to the default settings.
2679-800020-A03
FUNCTION
1
1
1
1
RELEASED 5/8/17 (WD CONFIDENTIAL)
FEATURES SECTOR COUNT REGISTER
REGISTER
AA
H
55
H
02
H
82
H
03
H
02h-DMA Setup FIS Auto-Activate optimization
10
H
06h-Software Settings Preservation
02h-DMA Setup FIS Auto-Activate optimization
90
H
06h-Software Settings Preservation
ATA C S
OMMAND
D '
ON T CARE
D '
ON T CARE
D '
ON T CARE
D '
ON T CARE
D '
ON T CARE
39
ET