Patent ID: 8014243

Claim:
A method for predicting beta as a function of linear speed for CAV profiles, or disc radius for CAV writing, for writing electronic data on an optical disc, comprising the steps of: (a) performing a plurality of test recordings of signals in an outer test zone ( 40 ) of said optical disc at a plurality of predetermined recording velocities, wherein the test recordings is expressed in terms of an outer test zone measured beta target value obtained from a read laser beam reflected back from the power of a writing laser beam; (b) calculating at least one beta target values in a data zone ( 30 ) of said optical disc at a predetermined recording velocity, and using the at least one calculated beta target value and at least two outer test zone measured beta target values as input to a curve fitting method for predicting beta (power) as a function of linear speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on said optical disc; and (c) predicting beta (power) as a function of linear speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on said optical disc, for other linear speeds than the predetermined recording velocities, the predicting depending on the at least one calculated beta target value and the test recordings including test recordings at least two different predetermined recording velocities.