Hello, my old flash drive broke and I had to replace it, but the guide says that if I can't remember how my drives were assigned I should make a forum post. How can I make sure my data isn't lost?

Edited August 21, 2025Aug 21 by PapaBumwizz
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https://docs.unraid.net/unraid-os/manual/changing-the-flash-device/#what-to-do-if-you-have-no-backup-and-do-not-know-your-disk-assignments

After following the guide and mounting all drives as data drives, they are all showing up as unmountable - unsupported or no file system. Is there a way to fix that without formatting the drives?

post diagnostics.zip please

3 hours ago, MowMdown said:

post diagnostics.zip please

blackpearl-diagnostics-20250821-2346.zip

No filesystem signature is being detected by blkid; this can happen if there are multiple signatures.

Stop the array, and post the output from wipefs /dev/sdX1 for all the disks; note the 1 at the end.

That command as written won't wipe anything, despite the name, and don't forget to stop the array, or it won't work.

Assuming I just type that into the Unraid terminal in the web ui - though I'm not sure if I did it right.

root@BlackPearl:~# wipefs /dev/sdX1

wipefs: error: /dev/sdX1: probing initialization failed: No such file or directory

root@BlackPearl:~# wipefs /dev/sdX2

wipefs: error: /dev/sdX2: probing initialization failed: No such file or directory

root@BlackPearl:~# wipefs /dev/sdX3

wipefs: error: /dev/sdX3: probing initialization failed: No such file or directory

root@BlackPearl:~# wipefs /dev/sdX4

wipefs: error: /dev/sdX4: probing initialization failed: No such file or directory

You need to replace X with the correct drive letter, e.g., /dev/sdb1 ,/dev/sdc1, etc., for all the devices that were part of the array, you can see them on the main page

5 minutes ago, JorgeB said:

You need to replace X with the correct drive letter, e.g., /dev/sdb1 ,/dev/sdc1, etc., for all the devices that were part of the array.

Thanks, that makes more sense.

root@BlackPearl:~# wipefs /dev/sda1

DEVICE OFFSET TYPE UUID LABEL

sda1 0x52 vfat 1713-2868 UNRAID

sda1 0x0 vfat 1713-2868 UNRAID

sda1 0x1fe vfat 1713-2868 UNRAID

root@BlackPearl:~# wipefs /dev/sdb1

DEVICE OFFSET TYPE UUID LABEL

sdb1 0x0 xfs a567a6f8-d357-4c11-945d-1b641fc73547

sdb1 0x747024c4000 zfs_member 4424891659475749160 disk3

sdb1 0x74702504000 zfs_member 4424891659475749160 disk3

root@BlackPearl:~# wipefs /dev/sdc1

DEVICE OFFSET TYPE UUID LABEL

sdc1 0x0 xfs 4c38b447-b047-4015-bc5d-3f3f14a7fd65

sdc1 0x747024c4000 zfs_member 8373678609573088171 disk4

sdc1 0x74702504000 zfs_member 8373678609573088171 disk4

root@BlackPearl:~# wipefs /dev/sdd1

DEVICE OFFSET TYPE UUID LABEL

sdd1 0x0 xfs 311405d2-1821-4cf6-97d3-8a44170a979f

sdd1 0x44000 zfs_member 904432272713149213 disk1

sdd1 0x3a381744000 zfs_member 904432272713149213 disk1

sdd1 0x3a381784000 zfs_member 904432272713149213 disk1

oops, missed one:

root@BlackPearl:~# wipefs /dev/sde1

DEVICE OFFSET TYPE UUID LABEL

sde1 0x0 xfs 56d319b6-e333-49dc-8aeb-5f59bc102f7e

sde1 0x44000 zfs_member 16696117445970530796 disk2

sde1 0x7470b44000 zfs_member 16696117445970530796 disk2

sde1 0x7470b84000 zfs_member 16696117445970530796 disk2

All the drives have a ZFS and XFS signature; that is the problem, I assume you were using XFS?

Clicking on the disks and manually changing the filesystem from auto to the correct one should allow them to mount.

To resolve the issue permanently, you can use wipefs to wipe the extra signature. I can post more details if interested.

That seems to have worked, thanks! I'll be making a backup this time, so as long as the change persists I think I should be ok from here.