To minimize degradation in recording media and also obtain a more correct optimum recording power by lessoning the quantity of trial writings with respect to a data area in which the writing of data is to be actually performed which is on an information recording medium. 情報記録媒体上の実際にデータの書き込みを行なうデータ領域に対する試し書き量を少なくし、記録メディアの劣化を最小限にとどめると共に、より正確な最適記録パワーを得られるようにする。 - 特許庁