I have converted to internal boot on a mirrored set of SSDs without issue. I am continuing to use the USB for license as my server does not support TPM 2.0 at current. After completing the internal boot setup I see the follow in Unassigned Drives (as expected):

Now a question - what can I do with this USB drive now? Do I have to keep it as above, or can I reformat it for some other use as long as I keep it in the system for license using its GUID. A thought I have is to use it as a backup space for the boot configuration.

Thanks in advance

You should be able to mount it manually and use it for other stuff, but it still needs to be formatted to FAT32 and labeled UNRAID to work for licensing, though it's possible that it would work with a different filesystem, as long as the label is still correct; never tested.

On 6/26/2026 at 2:27 PM, dd2594ur said:

I have converted to internal boot on a mirrored set of SSDs without issue. I am continuing to use the USB for license as my server does not support TPM 2.0 at current.

Your USB drive is now your license anchor -- if it fails your system won't be able to validate its license on the next reboot regardless of how healthy your SSD mirror is.

Worth making sure whatever is in that slot is a quality drive.