I've forgotten more about hard drives than most of you folks know.
There are 101 ways to lose your data - hard drive failure is merely one of them
Q9300 @ 400 x 7.5, GA-EP35C-DS3R, 8GB, HD4670, 750GB, 500GB, 2x 400GB, 2x 1TB
E4300 @ 333 x 9, P5NE-SLI, 4GB, HD3850