Patent ID: 8363516

Claim:
A method for compensating astigmatism in an optical storage system, wherein the storage system comprises an astigmatism compensator, comprising: (a1) controlling the optical storage system focusing on an optical disc and proceeding track seeking; (a2) adjusting a compensated values of the astigmatism compensator and recording the compensated value as a AS0_T; (a3) measuring a peak-to-peak values of a main push pull signal in response to the AS0_T and recording the peak-to-peak value of the main push pull signal as a MPPpp_T; (a4) comparing the MPPpp_T with a MPPpp_Max stored in a memory; and (a5) setting a AS0_OPT equal to the AS0_T and setting the MPPpp_Max equal to the MPPpp_T if the MPPpp_Max is smaller than the MPPpp_T; wherein steps of (a1) to (a5) are executed a number of times to acquire a first optimal compensated value from the AS0_OPT for the astigmatism compensator to compensate an astigmatism AS0.