[What does "unusable for duplication" mean?]

I appreciate this thread. 4tb unusable for duplication and I was looking for an answer and reading through the thread you guys answered about 4 more questions. I guess I'm reviving the conversation by replying. But thanks.

[Unknown Unallocated 2TB disk after replacing two drives. (Updated)]

I recently replaced two 4tb drives that were starting to fail with two 8tb drives. I replaced them one a time over a span of 4 days. The first drive replacement was flawless. The second drive I found an unallocated 2048.00GB Disk 6 (screenshot 1).

When looking at it via Drive pool's interface it shows up as a COVECUBEcoveFsDisk__ (Picture 2).

Windows wants to initialize it. I don't want to lose data. But I'm not entirely sure what's going on. Any insight or instructions on how to fix it?

Thank you.

 

*Update. My Drivepool is only 21.8TB large so i think it is missing some space. Forgive the simple math. 8+8+4+4 is about 24tb and im showing a drivepool of 21.8tb. Thats about what my unallocated space is give or take.

 

*New Update. After a few (more than 2) for windows updates and stuff and letting it balance and duplicate it resolved itself.