If your DVD is a video DVD
… you can't "convert" it to a USB drive that will behave like an authored DVD, e.g. with chapter marks, viewing angles, animated menus, et cetera. This is a feature of DVDs only. Your TV will only recognize individual media files and play them, one after another, until you reach the end of the current folder.
You might get the option to enable/disable subtitles, but this depends on the capabilities of the TV and the format the videos are stored in.
MKV allows for chapters to be created in videos, but your TV also needs to support this. Considering that Samsung doesn't offer the best MKV support as of yet, your mileage may vary.
If your DVD contains video files
… like MP4, MKV, AVI files, just pull them over to your USB drive and see if the TV reads them.
Is it a video DVD or a DVD containing individual video files? – slhck – 2011-09-28T18:45:25.683
yes, it contains invidiual .vob files. I realized just now that they are playable at tv :-P, so problem solved – Open the way – 2011-09-28T19:02:30.597
1Ah, I see! Would be best to delete the question then, I guess, unless you want it answered (?). – slhck – 2011-09-28T19:04:07.117
but I realized later that menus are not interactive, and that it is not easy to select chapter, a better approach then? – Open the way – 2011-09-29T05:02:24.503