@Efficiency93 I think I'm following down your same path... and am similar to you in that I get easily intimidated with things I don't understand. I've got the zoneminder docker setup and just put a surveillance hd in the machine. I think I installed the unassigned devices plugin correctly and am wondering if you could post those step by step instructions to add that drive to the zoneminder docker and possibly explain if you ended up moving all the appdata off the array/cache drives too. I think I remember reading that zoneminder does a lot of read/writes for events and stuff.
Any help would be greatly appreciated!