Wired has the full story about retrieving data on a ultra slow pathway:
How It Works
Computers produce varying levels of heat depending on how much processing they’re doing. In addition to the CPU, the graphics-processing unit and other motherboard components produce significant heat as well. A system that is simultaneously streaming video, downloading files and surfing the internet will consume a lot of power and generate heat.
To monitor the temperature, computers have a number of built-in thermal sensors to detect heat fluctuations and trigger an internal fan to cool the system off when necessary or even shut it down to avoid damage.

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