Patent ID: 7051054

Claim:
A method for emulating an erasable storage medium using a non-erasable optical disk, wherein the optical disk includes a writing area formed in a spiral track, the method comprising: writing a plurality of data files in the writing area, wherein a first data file is written from a first end of the spiral track, a second data file is written from the end of the first data file on the spiral track, and so on for remaining data files; generating a system sector for the data files, wherein the system sector identifies, for each data file, its location in the writable area and its size; writing the system sector in the writable area, wherein the system sector is written from the remaining end of the spiral track; generating an updated system sector whenever there is a change in the data files stored on the writable area, wherein the updated system sector identifies only, for each changed data file, its location in the writable area and its size, the unchanged data files being identified by the system sector; and writing the updated system sector in the writable area, wherein the updated system sector is written from the end of the system sector on the spiral track.