Patent ID: 7304931

Claim:
A recording medium on which information is recorded by applying a laser pulse to form a mark on a recording layer, the recording medium containing control parameters recorded for respective linear velocities decided by: a step of recording a first mark having a length not smaller than the laser spot diameter in the recording layer at a first linear velocity; a step of recording a second mark having a length equivalent to the first mark at a second linear velocity; a step of calculating an average value of the voltage values during an interval Ts (Ts<Tm/2) in the time axis direction before and after the time position reference Tm/2 from the front edge of an electric signal waveform obtained by reproducing the first or the second mark at a predetermined linear velocity and having a time width Tm; and a step of deciding a control parameter of the laser pulse power level change timing so that the aforementioned average value is substantially constant during recording at any of the linear velocities.