Hey there,
I recently wanted to switch from ESXi to UnRaid. After I installed the system on a USB drive I tried to connect the usb drive to the internal USB 2.0 port in the Microserver. But after setting all bios options the usb drive didn't start. It just told me "Attemping to Boot from USB DriveKey (C:)" but at this point it stopped doing anything. So after this I tried 3 other usb drives and all off the available usb ports on the server without a success.
After hours and hours of trying to get this working I tried to use a microSD card and installed UnRAID on the card. After putting it in the internal microSD card slot it worked. For the next 5 minutes I was super happy, but then, it told me, that a microSD card doesn't has a unique GUID and I can't license it because of this, so I'm back to my old problem: How to get it working with a usb drive. I really really hope that someone of you guys can help me... I'm just so frustrated...
Best regards!