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UEFI Basics

When you enable UEFI on a computer how does it know that a device is capable of booting via UEFI? Is it looking for files or partitions on that device to identify it as being UEFI compatible?

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8/22/2022 - Mon
Sushant Gulati

Easiest way to determine that you are booting through UEFI is when you see if you can disable the Secure Boot after pressing the F8 key after the POST.


Here is the link where you can read the difference between both the booting modes, the Legacy and the UEFI.


Well.... if UEFI is set and enabled in the BIOS that pretty much guarantees that I am booting UEFI doesn't it? I need to revert to the original question.

I have notices when I press F12 (for a boot menu) only certain things show up. Only things that are "UEFI" compatible. How does it know if a device is capable for booting UEFI? Is it looking for files or folders on that device?
Sushant Gulati

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That is what I was looking for. There is something on CDs, DVDs, Thumb Drivers, etc. That makes them UEFI bootable. It is the EFI folder and its contents. Thanks.
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