Nevermind, I went to how stuff works and got my own answer. I should have done that first.
Quote:
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Underneath the board are the connections for the motor that spins the platters, as well as a highly-filtered vent hole that lets internal and external air pressures equalize:
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Hard drives either didn't have that 10 years ago, or my instructor left that part out of the discussion or (more likely) I just forgot. Either way, it makes sense now.
-Cheers