in accordance with certain aspects of the present invention , enhancements have been developed to further extend the performance of the generic dvd navigator component . of significance herein , was the need to assign a unique identifier to dvd discs and the like . doing so allows player applications to easily identify , catalogue and associate information with each disc . previous “ unique ” id algorithms have failed to produce useful and reliable identifiers . thus , improved methods and arrangements are provided for use in the generic dvd navigator that produces substantially , statistically unique disc ids .