INCREASED NUMBER OF DIRECT OVERWRITES WHEN RECORDING ON OPTICAL DISCS

摘要

The invention relates to improving the number of Direct Overwrites when user information is recorded onto an optical disc of the rewritable, wherein the user information organized according to a recording format, the recording format prescribing that management information for managing the recorded user information is also recorded onto the optical disc, the management information further comprising reserved management information, the reserved management information being prescribed by the recording format independent of the user information to be recorded. When recording onto optical discs, the information is divided into data frames, a data frame comprising identification data and reserved data preceding the information to be recorded and/or error correction data succeeding the information to be recorded; the data frames are transformed into recording frames and the recording frames modulated into a sequence of channel bits to be recorded onto the disc. The gist of the invention is to modify at least a data frame comprising reserved management information such that at least a byte of reserved management information is replaced by freely chosen information. Preferably, the at least one modified byte is the first byte of Main Data in the Data Frame, and preferably the freely chose information is randomly chosen.