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I'm guessing you dropped the "2" in the divide by 2A step?

Exactly. Things like that kept happening in my student days - usually all problems solved, but a little "2" or "-" or "+/-1" got lost somewhere along the way

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Anyway, 2mm of deceleration would be enough to cushion it for a 500G stop. Calculating the actual G-load of a drop onto concrete is problematic, since the only "cushion" as such is provided by the deformation of the case and it's internal parts, and of course it is the deformation of those internal parts that does the damage to the drive.

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Yeah, I know -- I should get a life!

Me too