Hi friend! I am not very sure but you probably need some kind of driver for your media to recognized under Windows
Alex, thanks for your reply. This is media I've been recording successfully for 3 years, same hardware, same drivers. Device mgr and disk management recognize the drives and show they are working properly. It just occurred to me that if I "remove" the CD and DVD drives and then let XP re-detect them, perhaps it would solve the problem? I've never done that before, but that is the way it works, is it not?