Fujitsu MJA2500BH - Mobile 500 GB Hard Drive Product/Maintenance Manual page 198

Interface
*3) Serial ATA Functions
The host can enable and disable the following Serial ATA functions by issuing
this command after setting X '10/90' in the Features field and an applicable value
in the Sector Count field:
Non-zero buffer offset in DMA Setup FIS
DMA Setup FIS Auto-Activate optimization
Device-initiated interface power state Transitions
Guaranteed In-Order Data Delivery
Asynchronous Notification
Software Settings Preservation
*1 The device normally responds to the command but performs no
operation.
*2 This feature is disabled when power is on. While this function is
enabled, the device does not return the DMA Activate FIS for the first
data sector after the WRITE FP DMA QUEUED command is issued.
*3 This feature is disabled when power is on. While this function is
enabled, the device perform interface power save.
*4: This feature is enabled when power is on. While this function is enabled,
the device preserves the software settings across COMRESET.
5-124
Serial ATA function Sector Count field
01h (*1)
02h (*2)
03h (*3)
04h (*1)
05h (*1)
06h (*4)
C141-E293