I'm curious: how is the "motion sensor" on the iBook's hard drive rigged? I've never seen the inside of the latest revision machines, but if there is something that actually protects the hard drives from a fall -- what is it? And does it make swapping out the hard drives more difficult? I know on regular iBooks and old pbs that it was just a plastic caddy and some screws with bumpers and the hd cable to the logic board. What's the deal here? Yes, I'm thinking of doing a swap out with a better faster drive at non Apple pricing.