Motivation – Booting Windows in UEFI mode offers a couple mild advantages:
it’s more compatible with Clover if you’re booting OS X this way already
it’s supposedly the fastest boot sequence
For motherboard: Gigabyte GA-X99-UD4
Notes / Lessons Learned:
Disconnect all other drives than the one installing to
existing windows drives get targeted for reusing their boot partition and wouldn’t create all 4 “ideal” GPT UEFI partitions present on a cleanly installed drive (Recovery, System, MSR, Primary)
having my Mac Clover drive connected during these attempts allowed the setup utility to clobber my Clover boot with the Windows bootloader …
reinstalling Clover via VMware OS X guest DID NOT put the UEFI Clover bootloader back in charge!
had to delete/rename efiwindows folder and only then did the old EFI option start showing back up on the “BBS” bios boot volume picklist (F12)
Rufus flash usb boot tool – for my mobo, wound up working best with mbr and uefi-csm (counter to prevalent recommendation)
what really seemed to matter was putting the usb stick in a certain USB port! i used the chassis USB header with 2x USB3 and 2x USB2… going from left to right it was the second USB3 port that worked; the left port most never did
BIOS settings
fast boot didn’t seem to matter either on or off
legacy usb worked in disabled mode
worked with “other OS” selected
disabled CSM never worked – machine would not display bios after reboot (contrary to most UEFI guides’ recommendation)