Hey everyone, I hope I'm just being over-cautious by posting here seeking advice. I had a similar issue a couple years back that I vaguely remember fixing, but I can't remember the steps I researched for the life of me, so I wanted to reach out to the community for guidance before proceeding just to get more clarity.

My system had a sudden power loss a few days ago while I was out of state (go figure), and when I got home I noticed that I have two disks that are emulated and showing "Unmountable: wrong or no file system" in the array page. If I remember correctly, it should be checking and repairing the filesystem with the -L flag and the proceeding with a rebuild?

To rebuild I believe it's stop array, unassign emulated disks, start without assigning, stop array, reassign, start array, let it rebuild?

Sorry in advance for asking what I feel like is a silly question, I just get a little nervous when these things happen. I was shocked when I got home and went to do some work and noticed one of my shares being completely empty, so I'm just trying to proceed cautiously with guidance of minds smarter than mine.

Thank you in advance for any help and taking the time to look at my diags to help me make sense of it all.

EDIT: I forgot to mention that when I looked at my diags, I did notice disk 18 is shot.

ethan-unraid-diagnostics-20251208-2030.zip

Edited December 9, 2025Dec 9 by Squeeth

Check filesystem on disks 1, 18, 15 and 20, since 15 and 20 are not emulated and also have issues, it may be a good idea to also run memtest.

7 hours ago, JorgeB said:

Check filesystem on disks 1, 18, 15 and 20, since 15 and 20 are not emulated and also have issues, it may be a good idea to also run memtest.

Thanks for the response @JorgeB ! I know 15 and 20 were some rando disks I pulled from a pile I had and may be on their way out overall, good call on memtest too...I hadn't thought about that one. I'll get going on checking the filesystem on those disks and report back.

Thanks again for taking time to help :)