Assuming dev/sda is Linux and dev/sdb is Windows, I have grub on sda and Windows bootloader on sdb. I use a hotkey at boot to tell the bios which drive to boot from.
Theoretically windows thinks it’s the only OS unless it’s scoping out that second hard disk.
It updates Secure Boot in the BIOS, so you could completely remove Windows but the Secure Boot update would still be in the BIOS and affect the boot loader.
I should have been more clear,
Assuming dev/sda is Linux and dev/sdb is Windows, I have grub on sda and Windows bootloader on sdb. I use a hotkey at boot to tell the bios which drive to boot from.
Theoretically windows thinks it’s the only OS unless it’s scoping out that second hard disk.
It updates Secure Boot in the BIOS, so you could completely remove Windows but the Secure Boot update would still be in the BIOS and affect the boot loader.