Patent ID: 8310913

Claim:
An information recording medium having a disc shape comprising a recording layer configured to store information by light, the information being configured to be recorded on the recording layer with a mark and a space, wherein a channel clock period is represented by T, the mark corresponding to 2T or more can be recorded, write parameter information is recorded on a particular area of the information recording medium, the write parameter information includes first information relating to a first peak power value and a first bias power value of a first recording speed, second information relating to a second peak power value and a second bias power value of an increased recording speed which is a quadruple of the first recording speed, the second peak power value can be not less than the first peak power value, the second bias power value can be not less than the first bias power value, when the mark regarding 5T is to be recorded at the first recording speed, a first waveform having four pulses corresponding to the first peak power value is used to record the mark regarding 5T, and when the mark regarding 5T is to be recorded at the increased recording speed, a second waveform having two pulses corresponding to the second peak power value is used to record the mark regarding 5T.