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VerizonLover

macrumors member
Original poster
Apr 16, 2012
60
16
Whenever I plug in my external Thunderbolt hard drive, the fans spin up until I unmount (but not unplug) the drive.

Why is this?
 
Plug it in and let it spin up, then take a look at activity monitor. Look at the cpu tab and filter by highest usage.
 
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