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Re-enabling a disabled disk does not work in Unraid 7.2.4

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I have a Problem with re-enabling my Disk, the Disk 2 ist "disabled", propably because there were Connection Problems. The Extended SMART Test said "No errors".

So i wanted to re-enable it. I did:

-Stop the Array

-Unassign the Disk 2 (switch to "no device")

-Start the Array (Disk 2 says "Not installed")

-Stop the Array

The original Disk 2 is now automatically chosen again in Slot 2 of Array

-Start the Array

Disk 2 still shows "disabled" !

What do i do wrong? Do i have to format the Disk, before I start the Array? That's not what it says in the instructions.

  • Community Expert

You are likely to get more informed feedback if you attach your system's diagnostics zip file to your next post in this thread.

It is always a good idea to do this to allow us to see the current state of your system and so we can see logs and configuration information.

  • Author
1 hour ago, itimpi said:

You are likely to get more informed feedback if you attach your system's diagnostics zip file to your next post in this thread.

It is always a good idea to do this to allow us to see the current state of your system and so we can see logs and configuration information.

Here is my diagnostics.

unraid-diagnostics-20260307-1218.zip

  • Community Expert

The end of the syslog in the diagnostics is showing repeating

Mar 7 12:18:57 UNRAID kernel: critical medium error, dev sdc, sector 1302606 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=0s

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 Sense Key : 0x3 [current]

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 ASC=0x11 ASCQ=0x0

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 CDB: opcode=0x28 28 00 00 13 e0 4e 00 00 01 00

which indicates a problem with the flash drive which I expect explains your symptoms as it would mean that Unraid cannot save the disk configuration.

  • Author
19 hours ago, itimpi said:

The end of the syslog in the diagnostics is showing repeating

Mar 7 12:18:57 UNRAID kernel: critical medium error, dev sdc, sector 1302606 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=0s

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 Sense Key : 0x3 [current]

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 ASC=0x11 ASCQ=0x0

Mar 7 12:18:57 UNRAID kernel: sd 36:0:0:0: [sdc] tag#0 CDB: opcode=0x28 28 00 00 13 e0 4e 00 00 01 00

which indicates a problem with the flash drive which I expect explains your symptoms as it would mean that Unraid cannot save the disk configuration.

Thats interesting.

I have found the "solution" for me, i had to restart Unraid in "Safe Mode" and i was able to re-assign the Disk without Problems.
That wouldn't fit with the error affecting the USB flash drive, or is there a connection?

If it is always necessary, why does the documentation not state that you have to boot in safe mode before re-assigning Disks?

  • Community Expert
Just now, piers-93 said:

why does the documentation not state that you have to boot in safe mode before re-assigning Disks?

Because that's not needed, problem before was most likley related to the flash drive issues; monitor for more related errors.

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