UEFI

The Unified Extensible Firmware Interface identifies, initializes and performs simple diagnostics to test a computer's hardware. After these tasks are performed, UEFI loads and runs a boot sector or a Master Boot Record from a drive to start the computer's operating system. Like a BIOS, UEFI is stored in firmware, but parts of it may also be stored on a drive. Unlike a BIOS, UEFI contains additional trust mechanisms to ensure the operating system is loaded in a secure fashion.

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