40GB is marketing. For that, they assume 1GB equals 1,000,000,000 bytes. A GB is actually 1,073,741,824 bytes - 1024 bytes per kilobyte. (I think that's the correct number.
Ah, yes:
40,000,000,000 divided by 1,073,741,824 is 37.25. Only the marketing world views a GB as an even billion bytes. I can't stand marketing crap like that.
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If a drive can take the acceleration of a catapult off a carrier deck in an F-14 or F/A-18 I think it will survive your drop in your car. >>
Thing is, that acceleration is fairly slow. When a drive is dropped, it comes to a complete stop in a very tiny fraction of a second: going from free-fall to stop in an instant - that translates to a lot of G-forces. I can't give a precise number, since I don't know the time it takes for a drive to stop completely, at least, not a number that's exact. In short, dropping a drive on a solid floor isn't good.
