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Spurce: How to silence the CubeStation - SynologyWiki
The CS is a very nice thing, but out of the box it is not as silent as it could be. By modifying the box in the following way, the noise is reduced by more than the half.

Unwanted noises occur for two reasons. Firstly, there is direct noise from moving parts like spinning drive motors or fans. Secondly, spinning parts produce forces and transmit them to other parts, which will vibrate and make noise. So the most important and easiest thing in our mission is using components which are silent and have low vibrations.