Hello mr blackbeard (just kidding :-)) I would have thought some kind of virtual disk setup might be applicable here, if not try click here and look at the product on the right, read the spec, never used it but it claims to be able to copy your dvd's to hd and allow you to play them from there, quite why you'd want to...........
Most commercial DVDs are dual layer and contain more than the 4.7GB that you can fit on to a standard recordable DVD. This means you cannot simply copy the DVD. The program suggested by MAJ will decode the DVD and then re-encode it at a lower quality such that it will fit on a recordable DVD. The quality achieved is perfectly acceptable and I would be surprised if you notice the difference.
Have a look at this site for further information click here
click here takes you directly to the guides for DVD back-up.