Patent ID: 6631108
Filing Date: 2003-10-07
Classification: G11B

Abstract:
A method, comprising:writing a first data set, with a write timing, at an area on an optical disc that has spatial features that distort an analog read data signal, the distortion varying as a function of write timing; writing a second data set, with the write timing, at an area on the optical disc that has spatial features that distort an analog read data signal, the distortion varying as a function of write timing; reading the first data set and the second data set from the optical disc; determining a first read error rate for the first data set, and a second read error rate for the second data set, wherein at a particular write timing, the first and second read error rates are expected to be non-zero and equal, and for any write timing other than the particular write timing, the first and second read error rates are expected to be unequal; comparing the first and second error rates; and adjusting the write timing based on the comparison of the first and second error rates.