Is there a good way to mount a laptop hard drive in a desktop case so that its vibrations won't make the case hum?
In my hobby building of computer systems, I've tried for years to build a silent desktop. After many different attempts, I'm close. I have a desktop system built in a typical steel computer case. I use a Cosair power supply with a thermally controlled fan and the fan is often not even running. I used an oversized heat sink on the CPU with an "underpowered" fan, a "Coolink 92mm, 1100RPM, 11.5dba Fan (SWiF2-920)" which I can hardly hear even though it runs at full speed all the time. (The heat sink is gets warm to the touch.) I use a solid state hard drive for files that are most read-only and a laptop hard drive for files that are mostly read-write.
The imperfection in this system is that the vibration from the laptop hard drive sets up a very faint resonant hum in the computer case. (I verified the laptop drive is the source of the noise by running the machine with the drive unplugged.) I used standard plastic holders to mount the hard drives in the 3 1/2 in bays in the case. The laptop hard drive is a Hitachi Travelstar 5400 RPM which is known as relatively quiet laptop hard drive.
It seems there should be a way to isolate the vibrations from the hard drive by mounting it in a special way - rather than by taking global measures such as lining the whole case with foam.