I'm not on solid ground her, but it occurs to me that the port-overs include screen shots and enhancements that take advantage of the higher spec'd graphics handling. So the files will be larger. Just look at a port-over DVD in a PC and see if it's greater than 700MB. If it is less than a CD Full, the ripping process described in this forum might be the answer if you are determined to go to the time and effort.