Error during Windows 11 Installation after Unattended Disk partition

Check if you're using a legacy MBR disk layout, instead of UEFI GPT. If you wanted UEFI, but the system disk is MBR then try:

1. Boot Windows ISO with no unattended file.
2. Wait for the Setup screen. Open a CMD window with shift-F10.
3. Run diskpart:
list disk​
select disk 0 <-- Check this is the correct disk!​
clean​
convert gpt​
exit​
4. Close CMD, and reboot with your modded ISO.
 
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