No commercial product does this. (This should help people prove me wrong.)
Now someone may talk about ripping DVDs but let's not give them a pass since here the MPAA doesn't approve of such and the products can't do that out of the box with the machine as-is or as-supplied.
If you want to look into some DIY then do that but don't waste time looking for a commercial offering in the USA.
Hi. I was wondering if anyone knows of a product that acts as a DVD player, but plays the movies from a hard drive based source. I know it is possible to put movies on a hard drive and then play them through an xbox 360. But I'm going for a more clean look. I know there was a vendor a while back who had all his hd-DVD movies on some sort of hard drive system. Anyone with input let me know. Thanks.