Apparatus of controlling disk drive during initial stages of wake- up mode and method thereof

摘要

An apparatus implements a method of controlling a disk drive during initial stages of a wake-up mode when input of a command to the disk drive occurs during a sleep mode. Immediately upon receipt of a command input to a microprocessor controller (21) of the disk drive during sleep mode, power is restored to circuits (except for the spindle motor driver circuit) which were disabled during sleep mode. Then, a discrimination is made whether the input command is for picking up data from the disk and driving the disk to process the data. The discrimination is made by comparing the input command with a predetermined reference command stored in a memory (22) associated with the microprocessor. If the input command is not for driving the disk, the command is performed immediately. On the other hand, if the input command is determined to be for driving the disk, the command is performed only after power is applied to the spindle motor driver circuit (24) and the microprocessor controller (21) stands by for a predetermined time period. The stand by time period is to allow rotational speed of the disk to stabilize after energizing the motor driver to spin the disk. Accordingly, malfunctions caused by instability of the disk drive controller in the initial wake-up mode are be prevented.