Hey, I've got an ipad that Im selling so that I can pick up a new 3G version. Is there anyway that I can clean the HD on the one I'm selling (sorry if thats a stupid ?, Im not very tech inclined). I still need it to be functional for whomever buys it, just want to make sure none of my personal info is left on it anywhere. Thanks. (I assume Ill have to do it using a computer, I have an iMac if anyone knows how to do it using that)