Fujitsu MHS2020AT, Product Manual

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Interface
5-46 C141-E171-03EN
Multiword DMA transfer mode X 00100 000 (X’20’: Mode 0)
00100 001 (X’21’: Mode 1)
00100 010 (X’22’: Mode 2)
Ultra DMA transfer mode X 01000 000 (X’40’: Mode 0)
01000 001 (X’41’: Mode 1)
01000 010 (X’42’: Mode 2)
01000 011 (X’43’: Mode 3)
01000 100 (X’44’: Mode 4)
01000 101 (X’45’: Mode 5)
*2) Advanced Power Management (APM)
The host writes the Sector Count register with the desired power management
level and executes this command with the Features register X’05’, and then
Advanced Power Management is enabled.
The drive automatically shifts to power saving mode up to the specified APM
level when the drive does not receive any commands for a specific time. The
sequence in which the power management level shifts is from Active Idle to Low
Power Idle to Standby. The Mode-2 level requires the longest shifting time,
depending on the APM level settings. The settings of the APM level revert to
their default values when power-on or a hardware or software reset occurs for the
drive
.
*3) Automatic Acoustic Management (AAM)
The host writes to the Sector Count register 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, hardware and software resets.
AAM Level Sector Count register
Standard Seek
Slow Seek
Reserved C0h-FEh, 00h
80h-BFh
01h-7Fh, FFh
Standard Seek : Maximum performance
Slow Seek : Minimum acoustic emanation