Patent ID: 6598135
Filing Date: 2003-07-22
Classification: G11B

Abstract:
A system for defining rewriteable data storage media defined by ECMA Standard ECMA-272 2nd edition (1999) for 120 mm DVD rewriteable disk (DVD-RAM) as a write once data storage media and for storing data thereon, the rewriteable data storage media having a user data area, the system comprising:(a) a data storage device for reading and writing the data; (b) rewriteable data storage media disposed within the data storage device for storing data; (c) a media type indicator in the rewriteable data storage media adapted to define the rewriteable data storage media as write once data storage media; (d) a first write protect flag associated with each user data sector in the rewriteable data storage media, the first write protect flag having a data written state and a data unwritten state; (e) a second write protect flag associated with each user data sector area in the rewriteable data storage media, the second write protect flag having a data written state and a data unwritten state; (f) means for changing the first write protect flag and the second write protect flag from the data unwritten state to the data written state when data has been written to each user data sector in the rewriteable data storage media; and (g) means for preventing writing to each user data sector in the rewriteable data storage media when the media type indicator defines the rewriteable data storage media as write once data storage media and when each of the first write protect flag and second write protect flag are in the data written state.