@ badtiming. Not to keep beating a dead horse here on this unit but....any idea wtf this 4gig card does? According to the manual your suppose to be able to read it in the DVD menu. Is it just for throwing xtra music on? Or pictures maybe? Or is it to update maps? Any info on this would be nice. I'm also assuming that the reason I can't read it is because I still need to get that unit hooked to ground lol. But in the meantime knowing what it's officially for would be nice.