Abstract: A method of data storage in an optical storage media under multiple specifications. When a data is provided to store in a data area of the optical storage media under Mount Rainier (M3) specification, a first index of the data area under M3 specification is stored into a first data index area, i.e. an area of M3 file allocation table, of the optical storage media. Further, a conversion of the logical address of the data area from M3 specification to Method Two (M2) specification is proceeded, and a second index of the data area under M2 specification can be obtained and stored into a second data index area, i.e. an area of M2 file allocation table, which is in a general application area (GAA) under M3 specification, of the optical storage media.