Patent ID: 7839740

Claim:
A method of determining an optimum parameter value for a laser device for writing to an optical storage medium, the method comprising: writing a predetermined data pattern to the optical storage medium using an optical write head; measuring jitter values for the predetermined data pattern; and selecting an optimum operating output parameter value of the laser device for writing data to the optical storage medium in dependence upon the measured jitter values, the optimum parameter value optimizing the jitter value for the optical storage medium, characterized in that, during writing of the predetermined data pattern to the optical storage medium in a first scan of the medium, an operating optical path parameter value of the optical write head is varied according to a first predetermined profile, and, during writing of the predetermined data pattern to the optical storage medium in a second scan of the medium, the operating optical path parameter value of the optical write head is varied according to a second predetermined profile, different to the first predetermined profile.