A magneto-optical disk having a small-sized diameter and a large capacity and able to record and reproduce disk discrimination information, and a recording method and a reproducing method of the same, wherein a recording layer including a main recording region in which a first information is recorded,...http://www.google.com.au/patents/US7355929?utm_source=gb-gplus-sharePatent US7355929 - Magneto-optical disk and recording and/or reproducing method and recording and/or reproducing apparatus using the magneto-optical disk
