I've got a Frankenputer that is used as a workbench PC to help fix other machines. As such, it's only ever used when something else is broken, so there are often long stretches where it's sitting unplugged and offline.
I've heard that hard disks need to be spun up and used, every once in a while, in order to keep them functional. Is this true? If so, how often should I plug this thing in and fire it up, and how long should I let it run before putting in back in the garage?