optical digital and analog data recording media, namely, blank diskettes and tapes consisting at least in part of a photo-sensitive substance in which digital or analog data may be recorded and played back; optical digital and analog data recording and playback equipment for recording data, recovering data, and duplicating recordings, namely, optical disk recorders and players, optical tape recorders and players; apparatus for use in optical digital and analog recording equipment, namely, read heads, write heads, amplifiers, signal processors, encoders, decoders, and media drives and electromechanical servos; optical tape processing equipment utilizing optical digital and analog recording media, namely, read heads, write heads, media transport drives, amplifiers, encoders, decoders, and data input/output devices, namely, data input ports, data output ports, and audio and video output transducers and displays and instruction manuals sold as a unit; and computer software and instruction manuals sold as a unit for controlling the operation of optical digital and analog recorders