This is the a question that Plextor Europe answered today at www.plextor.be: "...PlexWriters support only media according to the Orange book standard as official recommended media. Media with capacity over 79 minutes are not part of this standard and are officially not supported on PlexWriters. Some PlexWriters can take benefit of such media and allow writing to the full capacity by means of a firmware upgrade. Please check on the Firmware pages for updated information on this topic..."