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UEFI Basics

LockDown32
LockDown32 asked
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Last Modified: 2017-04-13
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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Sushant GulatiConsultant
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Commented:
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.

https://www.quora.com/What-is-the-difference-between-UEFI-and-Legacy-Mode-which-we-need-to-choose-while-installing-the-OS

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

Best,
~SG~
LockDown32Owner
Top Expert 2016

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Commented:
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?
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LockDown32Owner
Top Expert 2016

Author

Commented:
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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