Power Commands; Power Management - Hitachi DK23CA-10 - 10 GB Hard Drive Specifications

6.3.2.6 Power Commands

6.3.2.6.1 Power Management

Supported commands and functions:
- Idle command
Idle Immediate command
-
- Sleep command
Standby command
-
- Standby Immediate command
Advanced Power management(APM)*
-
- Standby timer
(1) Low power consumption modes
The drive supports the following low power consumption modes.
Active mode : The spindle motor is rotated. Seek and Read/Write operations are activated. However,
the power mode is moved to Low Power Active mode if the host does not issue any
command within 200 ms after previous command completion. The Low Power Active
mode is a low power consumption mode cutting the power of the drive control circuit, but
the drive is keeping the active state of Seek and Read/Write operations.
Idle mode: Refer to Sec. 6.3.2.6.2 "Advanced Power Management".
Standby mode: State of ready to receive commands. State of ready to receive commands, but the
spindle motor is stopped. If the device receive a command with seek operation, the
spindle motor is rotated and the command is executed.
Sleep mode: This mode is the lowest power mode. The spindle motor is stopped. The device cannot
(2) Standby/Sleep command Operation
Standby, Standby Immediate and Sleep commands are executed with the following process.
Wait write command completion
-
Unload heads
-
- Clear BSY bit and enable INTRQ signal
Stop the spindle motor
-
- Move to a low power mode
K6602637
Rev.3
02.27.01
receive the command except Hardware Reset and Software Reset.
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