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XL500S
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
Set Acoustic Mode
Set Performance Mode
Disable Automatic Acoustic Management
Enable the PUIS feature set
Disablethe PUIS feature set
PUIS feature set device spinup
Enable/disable reverting to defaults
1
Changes are only valid while power remains applied to the drive. After power is cycled, the drive reverts to the default
settings.
2
Changes are valid through power cycles and hard resets.
2679-701211-A06
FUNCTION
1
1
1
1
2
2
2
1
1
1
1
RELEASED 10/21/10 (WD CONFIDENTIAL)
FEATURES
SECTOR COUNT REGISTER
REGISTER
AAh
55h
02h
82h
03h
10h
02h-DMA Setup FIS Auto-Activate optimization
03h-Device-initiated interface power state transitions
06h-Software Settings Preservation
90h
02h-DMA Setup FIS Auto-Activate optimization
03h-Device-initiated interface power state transitions
06h-Software Settings Preservation
42h
42h
C2h
06h
86h
07h
66h
ATA Command Set
Don't care
Don't care
Don't care
Don't care
Don't care
80h
FEh
Don't care
Don't care
Don't care
Don't care
Don't care
39
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