Some people use them to keep hard drives cool - as if you have say 3 drives in a standard desktop all on top of eachother, they could overheat. For a single or dual drive configuration there isn't much point, but if you have a server with lots of drives stacked then it can keep them cool enough to run 24/7 with a reasonably long lifespan
Altho depending on the case and the way you position the drives can make a difference aswell. I have an all aluminium case (Thermaltake2000) with six drives in, never have problem with the drives at all!
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