I've done several projects using DVDSP without an internal DVD drive connected and have been able to preview my work without a problem. I'm confused as to why some posters to this list are not able to preview their work without an internal SuperDrive. I've authored a couple of projects on my home computer, copied the muxed folders to my iPod, and then burned the DVDs on my work machine without a hitch. The preview feature worked fine on my Cube at home. Pat Wilson