Hitachi C4K60 Specifications - Page 37

Power Management, 2.2.1. Low power consumption modes, 2.2.2. Standby Timer

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7.2.2. Power Management Supported commands and functions: − IDLE command, IDLE IMMEDIATA command − SLEEP command − STANDBY command, STANDBY IMMEDIATE command − Advanced Power Management (APM) − Standby Timer 7.2.2.1. 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. - Active Idle mode: Heads are loaded, and kept on outer cylinder. - Low Power Idle mode: Heads are unloaded outside of the disk platters and the spindle motor is rotating. This mode is lower power mode than Active Idle mode. - 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 can not receive the command except Hardware Reset and Software Reset. 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 7.2.2.2. Standby Timer Standby timer is provided for automatic power saving control. The device automatically moves to the Standby mode if the host does not issue a command within the timer period. The Standby timer is disabled at power-on. The Standby timer value is changeable using Idle and Standby commands. The timer can be set up to 30 minutes. K6610170 Rev.2 Dec 22, 2004 - 37 -

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K6610170
Rev.2
Dec 22, 2004
- 37 -
7.2.2. Power Management
Supported commands and functions:
−
IDLE command, IDLE IMMEDIATA command
−
SLEEP command
−
STANDBY command, STANDBY IMMEDIATE command
−
Advanced Power Management (APM)
−
Standby Timer
7.2.2.1. 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.
- Active Idle mode:
Heads are loaded, and kept on outer cylinder.
- Low Power Idle mode:
Heads are unloaded outside of the disk platters and the spindle motor is rotating. This mode is
lower power mode than Active Idle mode.
- 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 can not receive the
command except Hardware Reset and Software Reset.
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
7.2.2.2. Standby Timer
Standby timer is provided for automatic power saving control. The device automatically moves to the
Standby mode if the host does not issue a command within the timer period. The Standby timer is disabled
at power-on. The Standby timer value is changeable using Idle and Standby commands. The timer can be
set up to 30 minutes.