Patent ID: 8913469

Claim:
An optical information storage medium system comprising: an optical pickup, comprising a photo-detector configured to control light power detected by receiving a portion of light emitted from a light source and configured to provide an output signal proportional to a light power of the light source from a signal detected by the photo-detector; and a signal processor configured to signal-process the output signal from the optical pickup, wherein the signal processor comprises: a sensitivity acquirer configured to acquire a sensitivity value of the photo detector; a gain calculator configured to calculate a target gain value by comparing the sensitivity value of the photo-detector with a target sensitivity value that is used by the optical information storage medium system; and a gain adjuster configured to adjust a gain of an output signal of the photo detector, which is input from the optical pickup, based on the target gain value, and wherein the signal processor is configured to generate an output signal in which the gain is reflected.