Older ATRAC formats from Sony required something called DRM or something like that.. basically limiting the file to be played only on the computer (this case headunit) that it was ripped on. The MAGIC-GATE (white cards) will work with this, but the normal blue/purple ones and the PRO line will not work (according to the manual). My friend borrowed my 2gb Pro, so I'll be testing it once I get it back... it's only $45 after rebate at Costco right now //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif