So I've just installed my Nas drive and selected single drive and it says I have 3.6TB available of 4, I'm using a WD Red NAS drive in this enclosure which is a terramaster f2-220, I'm aware it will not be 4 but isn't that a bit low? This is my first time configuring it and not sure what I need to change and also if this is correct or something I can change to get more storage available, cheers.