plextor wrote to me:
Dear sir, Booktype setting in Plextools software is only supported on the PX712A - PX 716A - PX755A Best regards
That is because those drives are true Plextor drives. I wish Plextor would name their rebadged drives with something other than PX... BenQ, who sells the same drive calls theirs the DQ60 instead of the DW16xx series...
Sorry calimero, you thought you bought a Plextor drive, but you didn't, if you get my drift. It only says Plextor on the plastic, but the inside of it is TEAC. Very misleading to those that don't follow what is going on in the forums at cdrinfo.com, cdfreaks.com, and other forums (cdrinfo is the best though