I have a new 16TB and then some older 14TB and 10TB disks that were NTFS before putting them in unassigned and choosing to blank them then preclear them with the plugin. After a bit the 14TB disc failed with a I/O error and I just want to clarify if perhaps I have a bad cable or the disk is going (it had no issues while in the windows desktop I pulled it from for years.

Here are my Logs pertaining to the Issue I believe, all disks but the Cache are on the H310 HBA.

Thanks.

preclear_disk_9RGT42JC_1726734.txtrvc-nas-diagnostics-20251106-0309.zip

Don't see anything logged with that disk in the sslog; do see what look like power/connection issues with the 16TB disk, but since SMART looks fine, try replacing/swapping cables and then try again.

What are you using to provide additional SATA ports? Is this disk connected to that?

1 hour ago, Frank1940 said:

What are you using to provide additional SATA ports? Is this disk connected to that?

They all are off a HBA H310 Perc in IT mode to a jonsbo n3 backplane. 8x sata

1 hour ago, JorgeB said:

Don't see anything logged with that disk in the sslog; do see what look like power/connection issues with the 16TB disk, but since SMART looks fine, try replacing/swapping cables and then try again

I now think this stems back to the issue I had earlier in the year. I supposedly fried an older h310 and one set of breakouts. But I got it all working at the time with the 4 disks I had at the time by moving them to the other set of breakouts vs using them spread out across 8 of them. Fast forward to today and I think perhaps the old hba might have fried the left side of my backplane (or it just went bad) it self as I have all new cables and another H310 with a fan on it which make it stay cool and still it seems that side is not very stable. As it started throwing pre read errors for the other disks I was preclearing as well after typing the OP. So now I have it all back on the last 4 bays and pulled the disks I was trying to add out to just get my main parity drive rebuilt as it got screwed up. When trying to make my parity bigger and swap it I noticed odd stuff like the main tab said disk X was named X and S/N X but in the identity tab for it was labeled as all the info of another disk Y that was supposedly unassigned at the time. And the unassigned area showed disks having capacity they don't have

After all of that I removed the preclear plugin as I read it's not actually needed anymore as the os will just do it for you when you add it to the array. Though I did want to test them before spending the time to do that on the array. But at moment I just need to keep it all as simple as possible to figure out the issues. My 16TB drive might very well be doa though as it got read errors in the last 4 bays as well. But also I had all 7 disks in there and found yet another possible issue that I need to use all of the backplanes power areas to use more than 6 disks but idk about that, I'm currently using 2x molex.

EDIT: I have zero idea why I cannot remove the quote things below that are duplicated and cant type below the links.

Thread 'Jonsbo N3 - ITX NAS CASE BACKPLANE' https://smallformfactor.net/forum/threads/jonsbo-n3-itx-nas-case-backplane.18942/

https://forums.unraid.net/topic/192609-one-disk-disabled-suddenly-and-it-shows-no-shares-even-though-its-emulated/#comment-157230

2 hours ago, JorgeB said:

Don't see anything logged with that disk in the sslog; do see what look like power/connection issues the 16TB disk, but since SMART looks fine, try replacing/swapping cables and then try

2 hours ago, Frank1940 said:

Edited November 6, 2025Nov 6 by rvcjew

Update, rebuilt parity with old disks all back in the 5-8 bays and it's fine. Jonsbo is indeed sending me a new backplane. Thanks for the advice.