Patent ID: 8284648

Claim:
An optical disk apparatus comprising: a laser configured to irradiate an optical disk with laser light; a laser driver configured to supply the laser with a laser driving current; a reproduced waveform processing circuit configured to optimally control a transmission characteristic and parameters in binarization determination for a signal reproduced from said optical disk, and configured to stop when a record strategy generation circuit is processing; an equalization error detection circuit configured to obtain an equalization error signal by using the transmission characteristic and the parameters in binarization determination; a phase error detection circuit configured to obtain a phase error by using an equalization error signal obtained by the equalization error detection circuit; the record strategy generation circuit configured to determine an optimum record strategy by writing data as a trial on a predetermined region of said optical disk and reproducing said data written as a trial such that the phase error between a waveform of the reproduced data and a channel clock is less than or equal to a predetermined quantity, and configured to supply the laser driver with information indicating the optimum record strategy.