the invention provides an information recording medium , such as an optical disk , having a large capacity and being capable of performing read / write operations at high speeds . the recording medium includes an audio stream prepared for after - recording data , and a audio attribute information having a bit rate information to the recorded audio stream as a management information . a recorder according to the invention has a check unit for checking , in advance , the possibility of after - recording operation of the recorder to the audio stream to be after - recorded with reference to the bit rate information of the audio attribute information .