A method for identifying digital data and reproducing the same by executing a software program stored in a memory of a computer is disclosed. The method includes: reading a plurality of source mediums; identifying digital data of the plurality of source mediums; saving the digital data as a temporary file; receiving a request for selecting a target medium, wherein the target medium is used for storing the digital data of the plurality of source mediums; determining a quantity of the target medium to be used for writing according to the size of the digital data and the size of the target medium; and writing the digital data of the plurality of source mediums into the target medium.