To work with HD video compared to SD. Speaking in reference to HD-DVD and BD compared to a SD DVD. I have been looking through the different how-to guides here and other places to make backups of my HD-DVD disks. Looked at a couple ways including conversion to BD, single file such as avi and standard dual layer disks. I really do not know much about the internal workings of how DVD's (SD or HD) work though I am knowledgeable as far as encoding video from working in 3d and rendering the animations. I don't think that transcoding video is much of the issue though. I just never dealt much with how the DVD's function. Therefore I don't understand why it is so difficult to create an application to such as DVD Shrink or CloneDVD that can take a HD-DVD and convert it to a BD or let you compress it to fit on a dual layer DVD while removing the extra stuff you do not need/want. I am sure I am not the first to ask but in doing some googling I really did not find an answer. Some speculation and maybe some actual fact but not anything I thought answers the question I thought was trustworthy. So I thought I would ask here as I figure there are quite a few that would know.