Datasheet

12.6 Power Management Feature
The power management feature set permits a host to modify the behavior in a manner which reduces the
power required to operate. The power management feature set provides a set of commands and a timer
that enables a device to implement low power consumption modes.
The drive implements the following set of functions:
1. A Standby timer
2. IDLE command
3. IDLE IMMEDIATE command
4. STANDBY command
5. STANDBY IMMEDIATE command
12.6.1 Power Modes
The device is in execution of a command or accessing the disk media with read
look-ahead function or write cache function.
Active Mode
Refer to the section of Adaptive Battery Life Extender Feature.
Idle Mode
The device interface is capable of accepting commands, but as the media may not
immediately accessible, there is a delay while waiting for the spindle to reach operat-
ing speed.
Standby Mode
12.6.2 Power Management Commands
The CHECK POWER MODE command allows a host to determine if a device is currently in, going to, or
leaving standby mode.
The IDLE and IDLE IMMEDIATE commands move a device to idle mode immediately from the active or
standby modes. The IDLE command also sets the standby timer count and starts the standby timer.
The STANDBY and STANDBY IMMEDIATE commands move a device to standby mode immediately
from the active or idle modes. The STANDBY command also sets the standby timer count.
12.6.3 STANDBY command completion timing
1. Confirm the completion of writing cached data in the buffer to media
2. Unload the heads on the ramp
3. Set the DRDY bit and DSC bit in Status Register
4. Set the INTRQ (completion of the command)
5. Activate the spindle break to stop the spindle motor
6. Wait until the spindle motor is stopped
7. Perform the post process
Hard disk drive specification for DSCM-11000/-10512/-10340
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