> What confuses me is I can turn on a hard drive that has no activity on it, 
> and it'll sit there making little chuckling noises, seeking around and 
> such. Like, even a USB drive not plugged into a USB cable will click and 
> seek and such.  I'm assuming the firmware is testing the drive or 
> something, looking for sectors to spare out, but it' kind of weird.

Probably some sort of continuous calibration system to account for 
temperature changes etc, I guess the head movement mechanisms need to be 
controlled pretty accurately!

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