An optical information recording medium for recording information by a plurality of record mark lengths, wherein the shortest mark length is at most 0.5 μm, and a crystal state is an unrecorded or erased state and an amorphous state is a recorded state, wherein the erasing is carried out by recrystallization...http://www.google.es/patents/US7539110?utm_source=gb-gplus-sharePatente US7539110 - Optical information recording medium and optical recording method
Optical information recording medium and optical recording method
