DVD is 4:3 and HD is 16x9 so it will letter box it. You can set it so if the DVD is played on a 16x9 TV it will feel the screen completely with no letter boxing and in this case pillar boxing. You can set it to Pan and Scan and that is like a center cut so the sides get cut off....I hate Pan and Scan. You have these three option in DVD studio pro. where you looking to do one of these?