Patent ID: 6882602

Claim:
A calibration method for an optical storage medium drive, the optical storage medium drive comprising: a pickup head for reading or recording data from or to an optical storage medium; a servo device for driving the pickup head; a signal generator for generating a calibration-driving signal; and a sensor optically connected to the pickup head for generating a sensing signal; the calibration method comprising: using the signal generator to generate the calibration-driving signal and then using the sensor to generate the sensing signal according to the calibration-driving signal; determining whether each period of the sensing signal conforms to a comparison rule; and sifting out periods of the sensing signal which do not conform to the comparison rule and comparing periods of the sensing signal that conform to the comparison rule with corresponding periods of the calibration-driving signal to determine a phase difference between the sensing signal and the calibration-driving signal so as to adjust gain of the control device of the optical storage medium drive according to the phase difference.