These common BIOS settings can secretly degrade your PC's performance, but thankfully they take minutes to fix ...

If you have to change the above settings before enabling Secure Boot, it’s best to save changes and restart your computer before accessing the bios menu again to enable Standard Mode Secure Boot.

BIOS looks for a target device to boot from that contains a master boot record. The MBR's boot code uses the volume boot code of that specific partition to identify where the system partition is.