Drop from 51 inches? No problem.
60 inches? Nine feet? Child's play.
15 foot drop (fifteen, that's one and a half stories) on concrete? p-shawww.
Run over with a Chevy Tahoe? Bring it.
Go over to Popular mechanics to see which hard drive faired the best.
link here: 4 New Portable Hard Drives: Abusive Lab Test (With Video)