Fix “Unexpected clusters per mft record (-127)”

I encountered this error yesterday after trying to fix some Windows bootloader issues in Ubuntu with ms-sys. Needless to say, I just created more issues and eventually couldn’t even mount my Windows partition from Ubuntu, as this would happen: # mount -t ntfs-3g -o force /dev/sda1 /mnt/win Unexpected clusters per mft record (-127). Failed to [...]