I imagine that the hard drives themselves wouldn't be filled with the oil - perhaps wrapped in a heat-conducting plastic beforehand, or maybe drives are stored outside of oil altogether.

Does anyone have any statistics on what contributes the most heat? I'm assuming power supply and processor/GPU are the worst offenders.

Edit: yup, the drives are wrapped:

> First, our technicians remove server fans and put them aside for future use or reverse-modification at a later date. Then, each hard drive is encapsulated using GRC’s proprietary hard drive sealing system. Finally, the CPU thermal grease is replaced with a non-soluble foil.