I'm assuming you are talking about the new system in the 2009. I'm currently using a 4GB USB drive that has MP3s and AACs on it. Everything seems to work fine. The only thing that you can't play with a USB drive is protected content. In order to get music onto the hard drive you will need to use CDs and rip the music just like a computer. I haven't had a chance to do that in mine yet.mkritch said: