I have a Pioneer DVR-103 in an external FW enclosure. My G4 Quicksilver 800 MHz can read/write to it (e.g., via Toast), but it does not recognize it as a Superdrive, so iDVD doesn't work with it, and, in fact, when I updated my Jaguar and/or iLife, they would not even think of loading iDVD or DVD Player. On the other hand, I replaced its internal CD burner with a Pioneer DVR-105, and that **IS** recognized as a Superdrive, and I can use iDVD and DVD Player with it. (I had to snarf DVD Player from the installation disc with Pacifist to get the ball rolling.) So, I think that the operative word is *internal* drive replacement. --Steve