POWER FAILURE MANAGEMENT IN DISK DRIVES

摘要

A disk drive is disclosed comprising a disk, a spindle motor operable to rotate the disk, a head actuated over the disk, an interface operable to receive a host supply voltage, and a capacitor. The host supply voltage is used to charge the capacitor to a capacitor voltage higher than the host supply voltage. During a power failure, the host supply voltage stops charging the capacitor, and a motor supply voltage is generated from the spindle motor. The capacitor voltage is used to operate control circuitry, and when the capacitor voltage decays below the motor supply voltage, the motor supply voltage charges the capacitor.

主权项

1. A disk drive comprising:
a disk; a spindle motor operable to rotate the disk; an interface configured to receive a host supply voltage; a power storage device; and control circuitry configured to:
use the host supply voltage to charge the power storage device; andduring a power failure:
stop charging the power storage device using the host supply voltage;generate a motor supply voltage from the spindle motor;use power from the power storage device to write a first portion of host data associated with a pending write operation to the disk;compare a voltage level of the power storage device to the motor supply voltage to determine when the voltage level of the power storage device becomes less than the motor supply voltage;re-charge the power storage device using the motor supply voltage when it is determined that the voltage level of the power storage device has become less than the motor supply voltage; andwrite a second portion of the host data to the disk using the re-charged power storage device.