^ Should not have an issue with Fat16 or 32 (vs ntfs) format. dot VOBs are limited to 1 gig. Blu-ray are typically 12->40 gigs for a single file and can not be copied to a Fat16 directory (not sure about Fat32, but probably also true.
Please edit my post and delete the following if inapproprate.
If these are your personal "BOUGHT and paid for DVDs" you should be able to place on a HDD for viewing or as a Back-up in case the orignal becomes a frezzbee. IF you are "Barrowing" these, then It is illegal to copy them!!!
Purchase AnyDVD (NOT a Free program) install and that should solve your problems.