I have used k9copy and thoggen for ripping DVDs, they work fairly well, but
some DVDs have dummy files that fool the programs into writing 20+ GB of
useless stuff to the file. I think it's some kind of DRM encoding to make
it harder to back up the content you have paid for. It also will shrink the
file size to something that will fit on a CD or DVD-R. I believe they are
in the repos.