Interface
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
APM Level | Sector Count Register | |
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|
|
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) |
| 00h, FFh |
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|
|
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. |