On the power disable feature topic, I’ve only bought a few used enterprise drives from Goharddrive.com and Serverpartsdeals.com, but they both included a handy little SATA power adapter with each drive for exactly that reason.
The first desktop I installed them in worked just fine with the factory PSU cables, but when I upgraded I was left scratching my head for a few minutes until I remembered those adapters!
I’ve never heard of this… what’s the idea behind it? That you get the RH near 100%, and any dust particles will be a nucleation point for water to condense on, causing them to literally rain out of the air?