Uefi vs legacy [Solved/Closed]

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ac3mark
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Dear All,
In my Laptop BIOS, I saw Boot Option has two Choose, "UEFI and LEGACY"
I wonder, what are they?
When i tried to get into BIOS and Change BOOT Mode to "UEFI"
My computer won't boot and BIOS message alert
"Default Boot Device missiong or Boot failed.
But when i change Boot Mode in BIOS to LEGACY
I can boot Windows As normally.
Could you explain me what is UEFI and LEGACY?
What they are using for?
Regards

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Legacy is usually another word for Proprietary. The reason why it would work, is because a propriatary anything does not have to adhere to any standards.

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