Patent ID: 8385172

Claim:
A method for controlling an optical pick-up unit to record a first mark with a first length and a second mark with a second length onto an optical storage medium, comprising: checking if recording of the first mark requires a power transition from a first laser power level to a second laser power level and checking if recording of the second mark requires a power transition from a third laser power level to a fourth laser power level; when the recording of the first mark requires the power transition from the first laser power level to the second laser power level, making a specific control signal transmitted to the optical pick-up unit have a logic transition from a low logic value to a high logic value and other control signals have no logic transition; and when the recording of the second mark requires the power transition from the third laser power level to the fourth laser power level, making the specific control signal transmitted to the optical pick-up unit have the logic transition from the low logic value to the high logic value and other control signals have no logic transition; wherein the first length and the second length include a shortest mark length and a second shortest mark length allowed by the optical medium.