I do believe it was a rusty knife but again it may just be my memory thats rusty.

I worked at a company where they kept losing toughbook hard drives. They are not cheap to say the least because they reside inside a gel-suspension. Come to find out the techs were laying the toughbook at eye level on top of 15000 watt generators for extended periods of time monitoring the SCADA system. There's only o much vibration any hard drive can take...