Disk device with auxiliary battery and start method thereof

Details Disk device with auxiliary battery and start method thereof Disk device with auxiliary battery and start method thereof

1994-06-10

1996-07-02

Wysocki, Jonathan

Electricity: motive power systems

Having plural, diverse or diversely controlled sources

360 7303, 318272, H02P 100

Patent

active

055325637

ABSTRACT:
A disk device, such as an optical disk or magnetic disk, for a computer is mounted on the computer or inserted in a slot in the computer. The computer or host device provides a power supply for the disk device that is used to drive the disk in rotation and power the seek operation for read and write. When the disk device is in an idle mode in which the disk media is not spinning, the disk(s) must first be driven to the access speed of rotation during a spin up or start of rotation time period. The current supplied by the external main power source for the computer provides the start current for the spindle motor that drives the disk(s) in rotation. An auxiliary power source provides an additional current that is added to the current provided by the main power source to decrease the time in which the start operation is executed or to ensure start up when only a limited amount of current is available from the main power source. The auxiliary power source is rechargeable from the main power source, and the additional current from the auxiliary power source is not provided unless the charge state of the auxiliary power source is determined to be sufficient.

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