Information recording medium and method of recording or reproducing optical information employing the same.

摘要

An information recording medium comprises a disc-shaped substrate and a recording layer for optically recording and reproducing information by means of a laser beam which is provided on the substrate, and the surface of the substrate is provided with a tracking guide comprising grooves having a depth of 200 to 600 angstroms and a width of 0.3 to 0.6 mu m. A method of optically recording information and a method of optically reproducing recorded information using the information recording medium are also disclosed.