Ok, I'm getting the parts together to build a new Linux box. One of those parts is my secondary HDD, where my Linux partition lives. I used GRUB as the bootloader in the MBR and everything worked ...

This post provides guidance on the 2-step process to successfully uninstall Linux in Windows 11/10 Dual Boot setup without losing data.

Bootloader gap: Many Linux distributions are at risk There is a security gap in the bootloader shim, which also allows secure booting for non-Windows operating systems.

The flaw is located in the GRUB2 Linux bootloader, but because of how Secure Boot is implemented, it can be used to compromise the booting process of Windows and other systems as well.