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Reducing Fan noise of a NAS device.

Step 2What to do about the fan?

What to do about the fan?
The disk vibration was actually caused by loose screws, so that was easily fixed.

Next the fan: how to reduce its noise?

I could think of the following options :
-replace with quieter model
-reduce fan speed.

I opted for the second, knowing that the spare small fans I had were equally noisy.

The preferred option would have been to get a smart speed control, but this would have to be completely self-supporting and a design was not readily at hand.

So eventually I opted for the simplest: reduce the fan speed by adding a resistor.
This reduces overall airflow so introduces the risk of overheating. But the NAS webpages show the temperature of the disk, so I decided I could monitor if cooling is sufficient using that information.
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Author:tinkerboy