Patent ID: 7330421

Claim:
An optical storage medium recording and/or reproducing system comprising: a laser diode drive control apparatus producing a driving frequency for driving a laser diode such that a difference between a beam power, which is fed back from a pickup diode or another laser diode, and a predetermined reference beam power of the pickup diode or the other laser diode is minimized according to a detected optical storage medium type of an optical storage medium and an optical storage medium mode of a recording mode or reproducing mode of the optical storage medium, wherein the laser diode drive control apparatus further comprises a clock generator to generate a system clock according to the optical storage medium type of the optical storage medium, wherein the laser diode is selected from a plurality of laser diodes according to a required size of a laser beam, and wherein the required size of the laser beam is dependent on whether the optical storage medium mode is in the recording mode, reproducing mode, or erasing mode.