Patent ID: 7406015

Claim:
An information recording medium that contains information at a predetermined position of said information recording medium indicating whether an asymmetry value is available for adjustment of a recording condition, the information being based on a comparison result between asymmetry values obtained from signals recorded under at least two or more recording conditions, wherein a first asymmetry value at a first recording power in which jitter becomes minimum is compared with a second asymmetry value at a second recording power that is smaller than said first recording power, wherein if a difference between said first asymmetry value and said second asymmetry value is greater than or equal to a predetermined value, said information indicates that adjustment of the recoding conditions using the asymmetry values is possible, while if a difference between said first asymmetry value and said second asymmetry value is less than the predetermined value, said information indicates that adjustment of the recoding conditions using the asymmetry values is not possible.