Patent ID: 7355929

Claim:
A magneto-optical disk comprising: a recording layer made of a magnetic film having a magnetic anisotropy in a perpendicular direction to a surface of the magnetic film, said recording layer having (1) a main recording region for recording first information, (2) a sub recording region formed on an inner circumference side from said main recording region for recording second information including disk discrimination information, and (3) a buffer region formed between said main recording region and said sub recording region for recording third information, wherein, said second information is recorded in a mark array formed in stripe shapes in a radial direction of said disk in said sub recording region and said buffer region, a plurality of marks constituting said mark array are parts having a changed magnetization state in said recording layer, and said third information can be reproduced by a modulation signal of a reflection ratio along a circumferential direction of the magneto-optical disk.