Patent ID: 6970403
Filing Date: 2005-11-29
Classification: G11B

Abstract:
1. In an optical disk drive having an optical pickup unit, a focus servo system for controlling the focus of the optical pickup unit on an optical disk and for generating a focus error signal corresponding to the current focus condition of the optical pickup unit relative to a desired focus condition thereof, and a tracking servo system for controlling the tracking of the disk by the optical pickup unit and for generating a tracking error signal corresponding to the current tracking condition of the optical pickup unit relative to a desired tracking condition thereof, a method of calibrating the tracking error signal with a tracking error signal offset to optimize the drive for a best read function in which at least an error rate of data read from the optical disk by the optical pickup unit is minimized, the method comprising: insuring that the focus servo system is closed; insuring that the tracking servo system is closed; positioning the optical pick-up unit over a readable portion of the optical disk; reading data from the optical disk; measuring the error rate of the data read; incrementing or decrementing the tracking error signal with a tracking error signal offset; measuring the change in the error rate of the data read resulting from the tracking error signal offset; and reiterating the foregoing steps in such a way as to minimize the error rate of the data read.