If you've ever wondered what happens with a hard drive when you request data from your computer -- and, really, who hasn't? -- then this one's for you.
Those wild and crazy Slow Mo Guys, Dan and Gav, removed the cover of a 500GB hard drive and then filmed it in operation. First in regular time, when the actuator arm moved back and forth 22 times in one-quarter of a second -- too fast for the naked eye to see, no less count. Then they showed the same sequence, only 40 times slower.
Finally, they threw water all over it and showed that in slow-mo, too. Just because they could.