Patent ID: 7280304

Claim:
A method for compensating a slow-varying runout of a disk storage system, suitable for a disk storage system employing a disk as information storage medium, wherein the disk storage system reads data from the disk or writes data into the disk by means of a pickup head and the pickup head is able to output a position signal (PS), comprising: generating a basic runout compensation signal (BRC signal); according to the PS generating a runout error signal (RE signal); comparing the RE signal with the BRC signal for adjusting the runout compensation signal (RC signal), wherein it comprises: comparing the phase of the BRC signal with the phase of the RE signal and according to the compared phase-difference deciding the extent of adjusting the BRC signal phase; and comparing the amplitude of the BRC signal with the amplitude of the RE signal and according to the compared amplitude-difference deciding the extent of adjusting the BRC signal amplitude; and using an RC signal obtained by adjusting the BRC signal for further adjusting the pickup head.