I've tried installing OMV 4.1.3 on two different WD disks, but I get the same failed result.
Everything seems to be going well until the installation is supposedly completed and I have to remove the installation media/Sandisk USB flash drive before it reboots.
That's when I get the "Reboot and Select proper Boot device" message. I did of course change the BIOS boot settings to boot the WD disk that I installed OMV on.
The weird thing though, is that if I leave the Sandisk USB flash drive on, with the installation media, and boot it, it'll sometimes(but not always) act as if I have already installed OMV and it'll ask for my root password.
Are WD disks not fully supported?