For purposes of learning how to do this better, let me say that I am starting with an HD video in iMovie, although not always. The problem is not the camera. It will shoot HD, no problem. The videos vary in length but one hour is average. I would like to create an HD disc, which my existing burner will not do. I usually have either file extension m4v. or mov when I export the video. For example I looked at the size of a one hour medium size video a few nights ago and it was 890 MB. When I dragged and dropped it into the burner, it increases to +4GB. The program asks if I want to compress it, and if I do the aspect ratio makes everything look weird. If I don't, I end up with a huge file that doesn't look that great. Plus sometimes it gets stuck and I usually end up burning it directly to my disk utility and then to the DVD. I don't know if any of this makes sense because I am a still photographer and all this other stuff is very new to me. Thank you for your help.