Patent ID: 8040777

Claim:
An information recording medium comprising: a material enabling recording of information by forming a first state and a second state in the information recording medium, the material being responsive to irradiation of a plurality of recording light pulses including at least a first recording light pulse and a last recording light pulse for forming the second state of the information recording medium; a control data zone which stores control information and an information zone enabling recording and storage of other information; wherein the control data zone stores control information of a shifting value for shifting of at least a leading edge of the first recording pulse and a trailing edge of the last recording pulse of the plurality of recording light pulses in accordance with a mark and at least one of a space preceding and subsequent to the mark to be written in the information zone; and wherein the shifting value is determined by combinations of a length of M(n) of the mark being currently written in the information zone of the information recording medium and at least one of a length s(n−1) of the space preceding to the mark and a length s(n+1) of the space subsequent to the mark in accordance with the material of the information recording medium.