Patent attributes
Before erasure of data, an optical head (6) reads file management data which manages user data from a file management data area “A” of an optical disk (2). A control unit (3) writes the information to a hard disc drive apparatus (10) and/or RAM (9) to save the file management data. After saving of the file management data, the optical head (6) writes the data for erasing the file management data into the file management data area “A”. According to a signal from the data erasure cancel instruction key or button (42, 52), after erasure of the data, the control unit (3) reads the saved file management data from the hard disc drive apparatus (10) and/or RAM (9). The optical head (6) writes the file management data into the file management data area “A” of the optical disc (2) so as to be returned. Thus, even after data erasure processing, the user use the user data again before erasure by using the file management data.
