Patent ID: 7885160

Claim:
A method of recording information on and reproducing the same from an optical disk comprising: a first step of writing data on trial in a first area of an optical disk at a first speed; a second step of reproducing the data written on trial on the optical disk; a third step of binarizing a reproduced signal obtained from the optical disk; a fourth step of synchronizing the binarized signal with a reference clock to obtain a reproduced synchronization signal; a fifth step of measuring a phase difference between the reproduced synchronization signal and the reference clock; a sixth step of optimizing the shift adjustment of a recording pulse applied to the first area on the basis of the phase difference; a seventh step of determining the shift conditions of the recording pulse for recording data in a second area of the optical disk at a second speed different from the first speed on the basis of the optimized shift adjustment value; and an eighth step of applying the recording pulse to the second area of the optical disk on the basis of the shift conditions obtained at the seventh step.