I shut down my Unraid server before, but I got this error when I opened it today, I tried unplugging all hard disks and booting in safe mode, and I got the same error.

 

Could it be that the thumb drive is broken?

 

Any ideas are welcomed, and let me know what diagnostic info I can provide.

 

Thanks.

Try recreating the flash drive, backup current one, recreate manually or by using the USB tool, restore the config folder from the backup. 

21 hours ago, JorgeB said:

Try recreating the flash drive, backup current one, recreate manually or by using the USB tool, restore the config folder from the backup. 

Is there a manual for this? I'm concerned about data loss. Also, should I replace a flash device, thanks.

First I would try recreating the current one, instructions are basically what I've posted, backup current, re-dot it, restore config folder, which part do you have doubts?

On 12/23/2022 at 4:08 PM, JorgeB said:

Try recreating the flash drive, backup current one, recreate manually or by using the USB tool, restore the config folder from the backup. 

I plugged the flash drive into my PC and saw a lot of files, including config.

 

You mean I copy all these files to the PC, and then use this flash drive to recreate a UNRAID boot disk, only need to copy the config folder back to overwrite it?

 

Is my understanding wrong? Thanks for your answer.

22 hours ago, guangyuan said:

You mean I copy all these files to the PC, and then use this flash drive to recreate a UNRAID boot disk, only need to copy the config folder back to overwrite it?

Basically yes, for the backup you can also only backup the config folder, unless you've created some custom script or other files elsewhere the config is all you need.

On 12/23/2022 at 4:08 PM, JorgeB said:

Try recreating the flash drive, backup current one, recreate manually or by using the USB tool, restore the config folder from the backup. 

Thanks for your help, problem solved！