Patent ID: 7602682
Filing Date: 2009-10-13
Classification: G11B

Abstract:
1. A method of determining an optimum power level for a laser device for writing to an optical storage medium, the method comprising acts of: defining a test region of the optical storage medium; using a laser device having an operating output power level, writing a predetermined data pattern to the test region; measuring jitter values for the predetermined data pattern; and selecting an optimum operating output power level of the laser device for writing data to the optical storage medium in dependence upon the measured jitter values, the optimum power level minimizing the jitter value for the optical storage medium, wherein during writing of the predetermined data pattern to the test region in a first scan of the medium, the operating output power level of the laser device is varied according to a first predetermined profile, and, during writing of the predetermined data pattern to the test region in a second scan of the medium, the operating output power level of the laser device is varied according to a second predetermined profile, different from the first predetermined profile such that a maximum power level is written at a different step in the first predetermined profile than a maximum power level is written in a corresponding step in the second predetermined profile.