I have an ASRock X399 board with NVMe RAID support, but it requires pure UEFI support. I have gone into the UEFI (BIOS) and set CSM (Compatibility Service Module) to Disabled (UEFI only). When I boot into the Boot Menu (F11) I am shown only UEFI devices. I have used ImgBurn to create an ISO for many years and tried for a UEFI bootable ISO. I use Rufus to write the ISO to a USB stick and it boots fine. The strangeness occurs when I get to the W10 "Install Where" menu. I have to use "Load Driver" to be able to see the RAID drive properly. The loading of the drivers (3) seems to go fine, but Setup never displays the RAID device properly. I used an ISO DLed from MS and written to a USB by Rufus and it works fine. I do not know what additional information may be needed, but please let me - will keep an eye on the thread. I searched for information on settings for making a UEFI ISO and found none. Thanks and enjoy, John.
Edited by Johnhc, 21 December 2017 - 12:45 AM.