the back of the box should say. i think u need to be a hdd, either 20 or 120 gig. the 20 gig is just fine. its called streaming music with zune software or something else and then deleting old demos and videos. streaming really helps keep space.
I've also just looked on the box, and in the instructions to see if it says, and it doesn't, so I'm just going to presume that it requires a hard drive.
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