What am I missing? N5200B Adding disk to raid 5

[stumpy25]

So I have x3 WD 2TB drives in a raid 5, and I want to add a 4th.

What is the process?

My Thecus sees the 4th drive, but I can only check the box next to "spare", but I want to check the "used" box, but it's grayed out.

How do I add a 4th drive without deleting and recreating my RAID and loosing all my data?

When I go to "expand", it doesn't show anymore space. Sorry, I've RTFM, but I can't figure this out.

[stumpy25]

Crap! I logged this under the wrong topic. My bad. I think I got it figured out.

1. Insert disk
2. Go to RAID - Migrate Raid
3. click the "raid5 -> raid5" circle
4. Check the "available" box next to new hard drive
5. apply.