| 摘要 |
In the present invention, there is provided an information recording apparatus for recording information to an optical disk including: a data recording section configured to record data while changing laser power levels successively; a data reproduction section; and an optimum recording power calculation section configured to calculate an optimum recording laser power level by evaluating the quality of a reproduced signal, wherein the data reproduction section performs data reproduction based on a PRML procedure, and based on PRML reproduction information, the optimum recording power calculation section finds an E error formed by the difference in a Euclidean distance squared between the most and second most likely path metric values in order to calculate E jitter values, the optimum recording power calculation section further calculating as the optimum recording power a laser power level corresponding to the recorded data of which the E jitter value is the smallest.
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