Unified Extensible Firmware Interface

UEFI Advantages

UEFI Booting

Unlike BIOS, UEFI does not rely on a boot sector, defining instead a boot manager as part of the UEFI specification. When a computer is powered on, the boot manager checks the boot configuration and, based on its settings, loads and executes the specified operating system loader or operating system kernel. The boot configuration is a set of global-scope variables stored in NVRAM, including the boot variables that indicate the paths to operating system loaders or kernels, which as a component class of UEFI applications are stored as files on the firmware-accessible EFI system partition (Wikipedia)


Compatability support module supports legacy bios.

UEFI Can do things BIOS cannot

UEFI Firmware

UEFI Firmware

UEFI Boot Notes

Disk Format Notes

Am I using GPT or DOS

UEFI Secure boot



GPT is a standard for the layout of the partition table on a physical storage device used in a desktop or server PC, such as a hard disk drive or solid-state drive, using globally unique identifiers (GUID)