Playing/copying a DVD

I have a DVD that shows two folders. An audio and a video. When I copy those to to my external HD and connect the HD to WD Live, it shows multiple VOB files on my TV screen. When I play any, it plays for a few seconds and then the TV goes blank. What am I doing wrong?

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http://community.wdc.com/t5/General-Discussions/Playing-copying-a-movie/td-p/22584