why the fuck is my 6TB HDD MBR
i have like, 12 partitions too.
if you're getting 0x80300024, unplug all drives. windows so sensitive it doesn't like installing itself on a clean SSD with a dirty, MBR disk present.
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This is one reason why I make the bootable windows installer set to use UEFI and GPT... and the UEFI set to ONLY UEFI, no CSM for legacy devices.
If it's not your boot drive, it might be an easy fix though, you can use either Easus partition master or Gparted to change it to GPT... but it might erase anything you have on there IIRC.