What is UEFI?
“After more than 30 years of unerring and yet surprising supremacy, BIOS — the IBM PC’s Basic Input Output System — is taking its final bows and shuffling into the theater’s wings.
Taking its place in the limelight is UEFI, a specification that begun its life as the Intel Boot Initiative way back in 1998 when BIOS’s antiquated limitations were hampering systems built with Intel’s Itanium processors…
UEFI, or Unified Extensible Firmware Interface, is a complete re-imagining of a computer boot environment, and as such it has almost no similarities to the PC BIOS that it replaces.
While BIOS is fundamentally a solid piece of firmware, UEFI is a programmable software interface that sits on top a computer’s hardware and firmware (and indeed UEFI can and does sit on top of BIOS).
Rather than all of the boot code being stored in the motherboard’s BIOS, UEFI sits in the/EFI/ directory in some non-volatile memory; either in NAND on the motherboard, on your hard drive, or on a network share (more on that later).”
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