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Do you have the Krusader docker installed?

Probably New Config and copying that disk as an Unassigned Device is going to be the way forward. But before we get into those details. Go to Tools - Diagnostics and attach the complete diagnostics zip file to your NEXT post.

Obviously a hardware issue but I don't know what to suggest. Are you sure the power is good and enough?

Those will not produce the correct result.

Yes. The rest of that is unmenu and packages that unmenu installs. You will not be using any of that when you upgrade and it will be easier to troubleshoot what you have without a lot of extra stuff that has nothing to do with getting your server ready to upgrade. And, here is the upgrade wiki for you to study while we wait on replies: https://wiki.unraid.net/Upgrading_to_UnRAID_v6

Have you checked your BIOS to make sure it is trying to boot from the flash drive? Some BIOS will try to "help" you out when you add a disk by trying to boot from it or one of the other disks instead of the flash.

Likely that last one didn't complete and it is just a calculation artifact. Post your diagnostics if you want a better informed answer.

Please attach images and anything else like diagnostics directly to your post instead of linking to external sites. Even if it is a known safe site, it is a lot less trouble for people trying to help you if we don't have to deal with external sites.

And if any of that data is important and irreplaceable, you need to have backups of it anyway.

What do you have in mind for all those SSDs? SSDs in the parity array cannot be trimmed, and whether or not all models will work with parity isn't entirely clear. And your assortment of HDDs isn't really the way I would go about this either. It is better to have fewer larger disks than more smaller disks. Fewer disks requires less ports and other hardware, and each additional disk is an additional point of failure. Since you are just playing around right now, simplify your setup with just a couple of the newer SSDs in the cache pool and leave out those other SSDs and those old small HDDs. How full have you made all of those disks? If all the data will fit on the 8 3TB disks, then you could just go with that in the parity array and then use the Unassigned Devices plugin to copy the data from the other disks one at a time.

Same problem with Samsung Galaxy S7. Working great on my Samsung Galaxy Tab A (8", 2019)

If there is nothing wrong with any of the existing disks then there is no reason to do parity swap. Just replace parity and rebuild it, then replace disk4 and rebuild it.

For example, a HahlerDocs share for your documents, and a WifeDocs share for hers. Each can be private and each of you is only given access to the one that belongs to you.

That's why I quoted you saying it

Just follow the procedure I already gave here: It is totally safe, in fact you could just delete it since docker image is easily recreated. Sometimes I recommend deleting it when a user has messed up their docker image by filling it or they have made it too large, but yours seems OK.

I removed the link. Might have been a filesharing site that he had no commercial interest in, but...

Separate user shares You still need backups.

Maybe this is what you will have to do

I know what screen does, but I don't know why you are using it in this context since the command I gave you should execute quickly. The first line you quoted where you run screen would not result in the second line you quoted with the error message, so I don't know what you did after you ran screen.

/etc resets on reboot also. All the usual linux OS folders are unpacked fresh from the archives on flash, into RAM, and the OS runs completely in RAM. The usual method to get something like this to persist is a script that runs at startup using the User Scripts plugin.

You may want consider how you created that in the first place so it doesn't happen again. Any top level folder on cache or array is automatically a user share. If you specify a path to a top level folder on cache or array (or in /mnt/user) in a docker mapping or something it will create that top level folder and you get a user share named for that folder.

The reason I use NTFS on UD is specifically so I can take that disk to a Windows machine. Why are you using NTFS on UD if there is no windows computer available to you?

When you replace it, its data will be rebuilt onto the replacement drive so no need to move that data to other drives.

You can also set the "global" setting high (Settings - Disk Settings), then set the individual disks lower as needed.

The webUI isn't at 8080 normally. Try it without the port number OK I see you tried that already. See here for ideas on how to get us more information: https://forums.unraid.net/topic/9277-how-to-report-a-defect-and-capture-syslog-and-smart-reports/