Patent ID: 7133236

Claim:
A storage device control method for a storage device comprising a storage disk, a motor to rotate said storage disk, and a head to access a storage area of said storage disk, said storage device control method comprising: (a) acquiring a signal for detecting the rotational speed of said motor; (b) determining the rotational speed of said motor in accordance with said acquired signal; (c) comparing said determined rotational speed against a target speed and determining a drive current that is to be supplied to said motor with predefined timing; (d) changing a waveform of the drive current to be supplied to said motor, wherein at least a part of the waveform of the drive current being changed is a linear wave; and (e) determining, during a first timing cycle after said waveform change, the drive current to be supplied to said motor independently of the signal for said rotational speed detection after said waveform change.