Patent ID: 7035172

Claim:
A method of logically erasing contents of a rewritable optical disc in response to an erase command, the rewritable optical disc being optically rewriteable and having a program area and a program memory area (PMA), the program area being recorded with the contents as tracks, the PMA being recorded with at least two kinds of frames, one kind of frames containing identification information for identifying the rewritable optical disc and another kind of frames containing track information for indicating the tracks of the contents recorded in the program area, the method comprising: accessing the PMA in response to the erase command; detecting and deleting all of the frames containing the track information from the PMA, thereby logically erasing all of the contents from the program area; preserving the frames containing the identification information in the PMA, so that the rewritable optical disc can be identified at rewriting thereof even after all of the contents are logically erased from the program area of the rewritable optical disc; and deleting the frames containing the identification information instead of preserving the frames containing the identification information when the identification information is incapable of identifying the rewritable optical disc.