The minimum power consumption management was discussed from the device and system in operation scope, firstly.
从应用范围上讨论了器件级和系统级的最小功耗管理；
Besides, as the battery in the embedded system is limited and the power consumption of hard disk is high, a simple power management strategy is presented to reduce the system power consumption.
由于嵌入式系统中电池电量是有限的，而硬盘功耗比较大，驱动提供了硬盘电源管理的接口，用以降低系统的整体功耗。
The DPM (dynamic power management) is an important solution of reducing energy consumption in the system level.
其中动态功耗管理便是一种重要的减少系统范围的能量的方式。
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