Been using Virtualbox for a while, mostly using it to test some stuff and build Windows 7/8/10 for deployment.
I usually test those images using a VM that I PXe boot with and deploy the image using my WDS/MDT server.
All has been going fine, up until just after Christmas. After MDT installed the OS and rebooted, the VM wouldn't boot anymore and would get stuck at FATAL: No bootable medium found! System halted.
After many, many tries, I figured out that I could not use the deployed image because it formatted the drive in UEFI mode, meaning a 499MB FAT32 EFI partition, a 128MB MSR partition, a recovery partition and the primary partition containing Windows and the whole shebang.
I tried with another task sequence that formatted the drive in BIOS mode, meaning a 499 MB NTFS System Reserved partition + the usual recovery and primary Windows partition, and this worked.
Did Oracle/Virtualbox change anything in the latest release that makes it unable to install/boot in UEFI for Windows ?
I tried different settings, even though I usually just leave it at the default setting, and nothing worked until I reinstalled using the BIOS formatting mode. See the attachement for the usual settings that I have in my VM (note that PAE/NX is usually not ticked, I just tried it but didn't help and forgot to untick it).
Thanks in advance everyone!
