Patent ID: 7532548

Claim:
A method of managing overwrite on a write once optical disc, the disc including a user data area having a specified area where data is written therein, the method comprising: in response to a request that the specified area having the data written therein be overwritten, writing replacement-recording data associated with the request, starting from a rear portion of the user data area; recording, in a management area of the disc, first information indicating a last logical sector number of the user data area, wherein the last logical sector number has been changed in accordance with the replacement recording operation such that the recorded first information indicates a change in a size of the user data area according to the replacement recording operation; and recording second information indicating positions of the specified area and the replacement-recorded area portion, in the management area of the disc, wherein the writing step includes: jumping to an area immediately before the end of the user data area in a non-sequential manner; and writing the replacement-recording data on the area immediately before the end of the user data area.