Hi Guys I just built a gaming/editing PC using the ASUS Z390-A Motherboard and the Samsung SSD 970 EVO Plus 1Tb M.2_2 drive. My only other computer is a Mac and I used this to create a bootable Win10 USB. I couldn’t use unetbootin because I’m running 10.15 beta, I make the USB bootable in the Terminal (using /diskutil eraseDisk MS-DOS “WIN10” GPT disk2/etc) and copied the Win 10 install files to it - it boots up OK. My problem is that the Windows Setup process can’t install files to the drive after it’s created the partitions. Regardless of whether I delete all the partitions from the setup and let Windows create them, or use DISKPART in the console to do it… I get “We couldn’t create a new partition or locate an existing one. For more information, see the setup log files” The setupact.log file says of the main partition: “The selected disk space is not of type ESP” After a lot of messing around I think it might be an issue people have discussed where Windows gets confused about which drive is the boot drive, and tries to install Windows to the USB instead of the newly partitioned drive. I can’t change the boot order to fix this because while the NVME shows up in the BIOS, it isn’t something I can set the boot order of. if I use DART in the Rewpoair section I can see a C: (Recovery), D: (the install USB) and X: (Boot) drive I’ve been through a lot of the troubleshooting steps I’ve found online, including: Making sure CSM is disabled Unplugging all other drives Updating the BIOS Using DISKPART to manually create the partitions… but you can’t make GPT partitions bootable and Windows won’t install on MBR My BIOS settings are: Intel RST On PCH Storage Configuration -> SATA Mode Selection: AHCI Onboard Devices Configuration -> Hyper M.s X16: Disabled USB Configuration -> Legacy USB Support: Enabled USB Configuration -> XHCI Hand-off: Disabled CSM: Disabled Secure Boot: Other OS Boot Option #1: UEFI USB Stick Partition 1 Boot Option #2: UEFI USB Stick Partition 2 AMI Native NVMe Driver Support: On Any ideas what I can try next? Many thanks in advance!