Hard drive free space

Question: My computer is starting to run very slowly, and I have noticed that there is not much free space available on my hard drive. Could this be my problem? How much hard drive space should I leave free on my computer?

The IT Guy says:
The general rule of thumb is to leave at least ten percent of your hard drive space free. Different operating system tasks and software programs utilize “swap disk” space and “virtual memory” on your hard drive to perform tasks. When your free hard drive space gets too low, inadequate swap disk space is available for these tasks, so your computer performance can really take a hit.

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