Re: Watercooling HDDs
HDDs casings are designed to pass heat out to the sides, using the chassis effectively as a heatsink. Hence sidemounting tends to be the recommended solution.
Plating the bottom shouldn't be necessary - it's not like you're overclocking anything on the drive, or giving it additional voltage... so the circuitry is always in spec.
Most common way to look at it - MTBF of drive vs how long you're likely to keep that drive in service. All you're likely to do is increase the MTBF.
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