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[EUNKNOWN] can detach from mirrors and spares only

Western Digital Drives - The Preferred Drives of FreeNAS and TrueNAS CORE


Junior Member
Oct 27, 2019
So, I got an error that said my boot was degraded... Ok, no big deal. Turn off, pulled bad usb, reboot, added new USB, and tried to "Replace" the mirrored device.
After the resilvering I got this: (see image) ...
When I try and detach the "UNAVAILABLE" devices - It gives me an error [EUNKNOWN] can detach from mirrors and spares only. (I attached the error log that is associated.

So, I tried to UPLOAD CONFIG with my .db file from the last setup - And these boot mirrors are still there.
I am trying to get the system back to having two good boot USB drives.

Any help would be greatly appreciated. Thanks