Dell Precision M60 - Manual (Page 10)

docking device slot — Lets you attach your computer to a docking device. See the documentation that came with your docking device for additional
information.
fan — The computer uses an internal fan to create airflow through the vents, which prevents the computer from overheating.
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NOTE: The computer turns on the fan when the computer gets hot. Fan noise is normal and does not indicate a problem with the fans or the computer.
CAUTION: Do not block, push objects into, or allow dust to accumulate in the air vents. Do not store your computer in a low-airflow environment,
such as a closed briefcase, while it is running. Restricting the airflow can damage the computer or cause a fire.