Power saving apparatus for hard disk drive and method of control

Details Power saving apparatus for hard disk drive and method of control Power saving apparatus for hard disk drive and method of control

1997-03-13

1999-04-27

An, Meng-Ai T.

Communications, electrical: acoustic wave systems and devices

Borehole testing

39575006, 39575008, 367707, G06F 1300

Patent

active

058988807

ABSTRACT:
The present invention relates to a power saving apparatus for a hard disk drive in a battery powered computer and to a method of controlling the same in the battery powered computer. CPU of the power saving apparatus is configured to generate a request signal for receiving battery level data from a power control unit, to enable a disk cache to operate in a write back mode if the battery level is available for a predetermined time period, and to control the power control unit to produce a switch off signal after writing all data contained in the cache into the hard disk is completed in response to a power off system management interrupt signal from the power control unit. With this configuration, access to the hard disk drive is restricted and power consumption of hard disk drive is reduced without the loss of data in the cache when there is a sudden system power off.

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