GPT partitions, EFI boot. I want to have 2 windows 10 installs, one "normal" and other as a "test". I don't want the "test" version not to be able to change or even see anything but its own partition and I guess its own boot partition. Not looking to do this with Disk Management by removing the drive letter name. I would like something a bit more betterer. Something a virus can easily get around. I tried it with grub parttool hd0,1 hidden+, but apparently grub doesn't do it with gpt partitions.
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