Fujitsu MHT2020AT Product Manual page 120

Interface
Multiword DMA transfer mode X
Ultra DMA transfer mode X
*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
5-46
APM Level
Mode 0 Active Idle
Mode 1 Low Power Idle
Mode 2 Standby
Reserve (State Keep)
Active Idle: The spindle motor rotates, and the head is loaded on the
media.
Low Power Idle: The spindle motor rotates, and the head is unloaded.
Standby: The spindle motor stops, and the head is unloaded.
00100 000 (X'20': Mode 0)
00100 001 (X'21': Mode 1)
00100 010 (X'22': Mode 2)
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)
Sector Count Register
C0h-FEh
80h-BFh
01h-7Fh
00h, FFh
C141-E192-01EN