So I've discovered running games from a spare USB HDD. It's awesome. I want to keep all my favorites on one HDD. Lots of my older games are burnt to DVD already, and I don't have the original ISO. What's the best method (Windows7 or MAC OS X) to take my burnt DVD's and back them up again to an ISO that'd be loadable on to my WBFS drive? Should I just use disc utility in OS X to back them up, or is there a better way? Thanks.