Hello there,

first of all, I am not sure it there is already a thread which contains problem like I do, but I please be understandable, that I'm a bit upset, and really want to understand and try to solve my problem.

I wanted to run Parity Test, with correcting any found error's, but just after couple of minutes it stopped and Drive 3 has been disabled; so I look into our forum, for a solution and after couple of minutes I did this:
https://forums.unraid.net/topic/137130-device-is-disabled-contents-emulated-what-to-do/#comment-1247568

it recovered my data on Drive 3, so after that I wanted to check parity again, but it got even worse; after couple minutes same problem appeared with Drive 2, so again, I've tried with SYNC method, but it stops, and now it looks like this:

Im asking for a help; what steps should I do now, where to start?

Im completely have no clue with that. Thank You for Your understanding.

unraid-diagnostics-20250605-2337.zip

Looks more like a power/connection problem, cables, splitters, etc.

@JorgeB thank You for Your answer.

Will check cables, thanks.

2 hours ago, JorgeB said:

Looks more like a power/connection problem, cables, splitters, etc.

As always @JorgeB thank You for Your time and answer.

I will check all my cables, let's just hope that that's the main problem, BUT I will anyway check sectors on these two drives via hdtune in windows (will just take out these disks from the server, and check on a different machine).

But let's assume that this test will also be posivite (there won't be found any errors); which steps should I do to run array back without any errors? (If its a must then I would delete files, but its an absolute ultimatum...)?

Edited June 6, 20251 yr by rogales

UPDATE:

Okey, so I know what is wrong.

Drive 2 which is 4TB works poperly, where there were no errors

Drive 3 which is 8TB od data works properly, BUT only when the start procedure is normal - what I mean is that it can start normally, and its possible to access, but after some time it restarts, and can't be accesibe - so it's completely random. I think that electric side of the drive is corrupted.

So now I have a big problem because I managed to restore data (yesterday) on disk 3 (sync), but its functionality is getting worse and any random restart will interrupt the sync procedure on disk 2. That's why errors occurred and synchronization was interrupted.

To be honest, I don't know what to do now, I'm afraid I'll have to recreate the entire array and lose a lot of data. Is there any hope?

Edited June 6, 20251 yr by rogales

17 minutes ago, rogales said:

but after some time it restarts, and can't be accesibe - so it's completely random. I think that electric side of the drive is corrupted.

Did you try swapping cables/slot with a different disk to make sure the disk is really the problem?

I have followed Your suggestion, and... now it worked properly for aprx. 10 minutes, second time couldn't start, restarted for couple times, and so on. - different cable, where earlier another HDD worked without any issues for many hours. (and also different machine)
but this is HDTune report

Im pretty sure there must be something with electric side with this hard drive.

What can I do now. I have only one parity drive, and 2 of my 4 HDD's are now corrupted. One electrically, one aborted with data.

If it is important - I have "Fill Up" method active.

Edited June 6, 20251 yr by rogales

CRC errors are typically a SATA cable issue, not a drive problem.

I agree with You, but I also have to admit that I've pasted this error to chatGPT and ClaudeAI and there is also an information about power cycle, or spin up time, so it would be a proper guess to what I've witnessed "visually".

I've already ordered two 8TB IronWolf Pro drives, so I would be very thankful for a way to reorganize my array. Of course I would love not to lose my whole data, but I'm aware that this might happen.

Edited June 8, 20251 yr by rogales

Bump.
Anyone guys?

If you think the disk is bad, just replace it using a standard replacement

Yes, I'm 100% sure that electronic side of the HDD is broken.

Will update this thread, after I recieve my new HDDs.

UPDATE:

So now I know much more.

I've replaced disk 3 with new 8TB IronWolf Pro drive, reorganised my array, and so far so good, there are no errors and everything works fine.

I still want to look closer what's wrong with my old drive; rescanned it with few special for diagnostics apps, and on every it shows there is a connection issue (just like You said earlier with cables and so), so for now I will connect it for a couple of days with completely different machine than my Unraid server and will know everything; if I should still give it a chance, or just drill it through. :)