Most people has the habit of collecting DVD movies, however, the disc is really easy to be broken. it is really hard to protect them. So i backup my DVD collection on my computer. i watch the movies whenever i want. i use this DVD Ripper to help me.
it can convert dvd to any video format you want, such as: mp4, wmv, avi, mov, mkv, flv, 3gp and so on. Here i also recommend you a really powerful Total Video Converter. it can convert all videos to different formats.