ok so I remember with the original 360, if they found out you replaced the hard drive in the system they would ban it.
I know the slim model is different, more like a PS3 arrangement. can you stick what ever drive in there on the slims?

I have several that are taking up space and I was considering cleaning them up, make sure they work and selling them off for a few bucks.
I figured I'd throw a refurbed SSD in there or something, sell em for $80 or so but only if they don't get all butt hurt on the drives like they used to