Method and apparatus for discriminating optical information storage media

An optical information storage medium recording and/or reproducing apparatus comprising:

• an optical pickup unit to move an objective lens toward or away from the optical information storage medium at a predetermined speed to allow light reflected by the loaded optical information storage medium to be received by a photodetector;
• an RF amplification unit to output a sum signal obtained by summing the amount of the received light;
• a data layer discrimination unit to generate a first signal by comparing the sum signal with a first slice level, to generate a second signal based on the sum signal, to generate a third signal by comparing the second signal with a second slice level, to generate a fourth signal by performing an operation on the first and third signals, and to determine the number of data layers of the optical information storage medium based on the first through fourth signals.

An optical information storage medium recording and/or reproducing apparatus comprising:

• an optical pickup unit to move an objective lens toward or away from an optical information storage medium at a predetermined speed to allow light reflected by the optical information storage medium to be received by a photodetector;
• an RF amplification unit to output a sum signal obtained by summing the amount of the received light;
• a data layer discrimination unit to generate a first signal based on the sum signal, to generate a second signal by comparing the first signal with a slice level, and to discriminate the number of data layers of the optical information storage medium based on the second signal.