There is disclosed an over-write capable magnetooptical recording medium, which includes a substrate having spirally or concentrically formed land portions, and grooves formed between the adjacent land portions on its surface, and at least two layers including a memory layer having perpendicular magnetic...http://www.google.fr/patents/US5191564?utm_source=gb-gplus-shareBrevet US5191564 - Over-write capable magnetooptical recording medium having groove depth of 800 .ANG. or less
Over-write capable magnetooptical recording medium having groove depth of ...
