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5-122 C141-E239
APM Level Sector Count Field
Mode 0 Active Idle → Low Power Idle
Mode 1 Active Idle → Low Power Idle
Mode 2 Active Idle → Low Power Idle → Standby
Reserve (State Keep)
C0h-FEh
80h-BFh
01h-7Fh
00h, FFh
Active Idle: The spindle motor rotates, and the head is loaded on
the most inner position on media.
Low Power Idle: The spindle motor rotates, and the head is unloaded.
Standby: The spindle motor stops, and the head is unloaded.
*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:
Serial ATA function Sector Count field
Non-zero buffer offset in DMA Setup FIS 01h (*1)
DMA Setup FIS Auto-Activate optimization 02h (*2)
Device-initiated interface power state Transitions 03h (*3)
Guaranteed In-Order Data Delivery 04h (*1)
Asynchronous Notification 05h (*1)
Software Settings Preservation 06h (*4)
*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.
*4) Automatic Acoustic Management (AAM)
The host writes to the Sector Count filed with the requested acoustic management
level and executes this command with subcommand code 42h, and then
Automatic Acoustic Management is enabled. The AAM level setting is preserved
by the drive across power on and COMRESET.