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Toshiba Corporation Digital Media Network Company
Page 140 of 153
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11.11 Adaptive Power Mode Control
Adaptive Power Mode Control is a function to reduce power consumption without performance degradation.
The drive supports the following Idle modes of 3 levels. The drive enters into idle mode adaptively in accordance
with the command pattern.
11.11.1 Performance Idle
The drive enters Performance Idle mode at the completion of a command from host. In this mode, electric
circuit and servo is ready to process the next command without delay.
11.11.2 Active Idle
Some of electric circuit and servo functions are powered off in this mode. The heads are stopped near the
disk center . If a shock is detected by Shock Sensor, the drive enters into Performance Idle mode automatically.
Power consumption for Active Idle mode is 55% 65% lower than that of Performance Idle mode. Command
processing time is approximately 35ms longer than that of Performance Idle mode.
11.11.3 Low Power Idle
In Low Power Idle mode, the heads are unloaded on the ramp and the spindle motor continues normal rotation.
Power consumption for Low Power Idle mode is 60% 70% lower than that of Performance Idle mode.
Command processing time is approximately 400ms longer than that of Performance Idle mode.
11.11.4 Transition time
The transition time changes dynamically in accordance with the current command pattern.