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I settled with a SuperMicro's passive Atom solution and a Fractal Design mini case, able to hold six disks. It is very quiet when you tune down the fans and keeps the disks just below 40°C which is optimal for me. We have the NAS in the same room we sleep and it doesn't bother us.

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Do you spin down disks? In my case WD Reds generates more noise than cpu and case fans when there is no workload on system.

No. Keeping them running uses less electricity than spinning them up with our workload. The disks are floating with rubber connectors in the case and the noise is nothing we can hear to the bed.

http://www.fractal-design.com/home/product/cases/node-series...

Thanks, I have node 304 with 3 HDDs, there is no vibration that's true, but I hear spinning plates when there is no other source of sound. It does not look like there is acoustic management available for wd red.

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