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This is for MBR/BIOS installs of Windows. Use this guide if windows won't start booting at all, and the partition table is using MBR. If your disk is in GPT mode, use a different guide.
Windows 10 MBR Partition Layout: Windows 10 Partition Layout BIOS/MBR: https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/configure-biosmbr-based-hard-drive-partitions 1: SYSTEM - 100MB+ NTFS 2: Windows - Main Partition - 20GB+ 3: Recovery - 300MB+ (I recommend 550MB) Use diskpart, delete the first System partition. Recreate it using this. You may get an error after the rebuildbcd command, ignore it. You may need to change the C:\windows drive letter if it is currently mapped as a different drive. Copy to Clipboard
create partition primary size=100
format quick fs=ntfs label="System"
assign letter=x
active
exit
bcdboot c:\Windows /s x: /f ALL
bootrec /ScanOs
bootrec /RebuildBcd
bootrec /FixMbr
bootrec /FixBoot
Reboot and test |