| http://www.w3.org/ns/prov#value | - An optical information recording and reproducing method according to claim 11, wherein each time the recording medium is exchanged, the light beam is modulated by the special test signal to thereby form the test pattern onto the recording medium, the test pattern is produced and compared with the test signal, and at least one of the power level, pulse width, and pulse interval of the pulses formin
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