Wouldn't I get a low-power (battery) icon though? I didn't. I suppose the unit might have been wired into a low-power accessory that wouldn't allow it to draw the extra current, but that seems unlikely in a modern car, doesn't it? Especially since the radio is on a 10A fuse all by itself...

And more importantly, how would I fix it? Try and find someone with two 20G drives who wants to trade? :-P