A disk recording device records blocks of data such as musical information on a recordable disk where absolute addresses have been previously recorded. Address data indicating the starting and ending address of each block is recorded in a lead-in section, and recordable areas of the program area, such...http://www.google.ca/patents/US4862439?utm_source=gb-gplus-sharePatent US4862439 - Recording device that identifies recordable areas of a disk record
