Patent ID: 7830779

Claim:
A method of recording information on a disk-shaped information recording medium having an information recording layer comprising a recording layer and a light absorption layer, user data being recorded/reproduced only in one direction using a first laser beam, the recording layer being comprised of a write-once type recording material, the method comprising: recording medium identification data by applying a second laser beam from a side of the medium opposite to a side of the medium from where user data is recorded/reproduced; and reproducing the medium identification data by applying the first laser beam, wherein the light absorption layer is located between a surface of the side opposite to where user data is recorded/reproduced and the recording layer, and wherein the recording of medium identification data comprises indirectly recording the medium identification data only on the recording layer by heat propagation caused by heating the light absorption layer using the second laser beam, wherein the light absorption layer does not serve as a recording portion for the second laser beam and serves to improve a reflectivity against the first laser beam.