I followed the directions as originally posted (DOS_FAT_32 with MBR on the external) and got all the way through the windows virtual install without a glitch. When I rebooted my mac, holding option, the only boot option that appeared was my Mac HD.
Paragon Go Virtual 1.0 (Product Key With Serial)
Following some other comments in this thread, I started back over and reformatted the external to MS_DOS (FAT32) with GUID. Once I loaded the vmbk file to the virtual box, I went to settings and turned on EFI.
I tried a few ways but only this worked for me:Needed: USB flash drive 8GB or more, Windows iso, VirtualBox + Extension Pack, WinToUSB ( ) and of course the external drive. WinToUSB free works with Windows10 Home. Please read info on their site for other Windows versions.Use Bootcamp Assistant to download the Windows Support files (you might need to click in the menu for Action).Use Disk utility to format the USB flash drive to exFAT and the external drive to GUID HFS+ or FATCopy the Windows iso, Windows Support files and WinToUSB to the USB flash drive and eject.Install VirtualBox and Extension Pack. Start VirtualBox and make a Windows10 virtual machine (VM), be sure the USB port is enabled.Start the Windows VM. Attach the USB flash drive and the external drive that you want Windows on.Copy the files from the flash drive to the VMs desktop.Install WinToUSB. Open WinToUSB and select the Windows iso as source and the external drive as goal. Let WinToUSB do its work. Wait until it says 100% and then (important:) click HOME. Now copy the Windows Support files to the external drive.Close the VM and VirtualBox and reboot. As soon as you hear the startup sound hold the Alt-key until you see the options for startup. Choose the EFI disk.Now you have to install Windows. When finished, open the Windows Support folder and click setup to install the Bootcamp-drivers.Done!
The first virtualbox command failed with VERR_FILE_NOT_FOUND. I tried with the thumb drive still connected, and got a busy error. Solution was to use disk utility and eject just the partition (disk2s1), leaving the drive (disk2) alone.
The virtualbox was showing a black screen when trying to run with EFI enabled.Just in case you are having this issue, I fixed it changing Settings->Display->Graphics Controller to VBoxVGA instead of VBoxSVGA
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