I did HPA from 3TB to 2.19TB, parity built fine, array was good to go by all appearances, had same crash that I reported. HPA all drives down to 2TB (was first thing I thought of doing), rebuilt parity, same crash. (Taking note of Joe's input now, there wasn't a power cycle between) Now I just precleared all drives just to rule out hardware issues since it's all new gear (Yes I should've done that first but I'm a noob here). All 4 precleared fine. Now that I've ruled that out I'm going to start over from scratch and report back. I also just started with a fresh unRAID install, so we'll see how things go from here. Back to 3TB, gonna power cycle, HPA to 2.19TB, power cycle, and get the ball rolling again. I'm not frustrated... not worried about anything right now, no data involved... I'm just learning how everything works.
MB: Gigabyte E350N-USB3
HD: Hitachi 3TB 5400s x 4
See you guys in a day or two, not gonna start it right yet, got to go out right now.