@travisdh1 Yup, that's basically how it works. The insulating material is water-based and converts to steam during a fire, resulting in an endothermic cooling action. Additionally, the steam is forced out of the events which prevents heat from entering the unit. As for waterproofing, the drives are simply in a sealed box that relies on finned walls to conduct heat away during normal operation.
Those little Atom processors that they tend to use (I miss the Sparc32 days, it was just more interesting) use very little electrical power and produce very little heat and tend to last for forever. Pretty much unbeatable.