Unified Extensible Firmware Interface (UEFI)

Blog Post created by Issac08 Champion on Mar 5, 2018

UEFI is a specification that defines a more modernized model for the interface between computer operating systems and platform firmware during the boot, or start-up, process.It is expected to eventually replace BIOS.


UEFI is a more modern solution, supporting larger hard drives more than 2.2 TB, faster boot times, more security features, and—conveniently—graphics and mouse cursors.UEFI uses the GUID Partition Table (GPT) whereas BIOS uses the Master Boot Record(MBR) partitioning scheme.GPT and MBR are both formats specifying physical partitioning information on the hard disk. Below I have listed the difference:

  1. Max partition size in MBR(BIOS) is ~2TB whereas in UEFI it is ~9 ZetaBytes
  2. MBR can have at max 4 primary partition whereas GPT can have 128.
  3. .MBR can store only one boot loader whereas GPT has a separate dedicated EFI System Partition(ESP) for storing multiple boot loaders This is very helpful if you have two or more operating systems which require different boot loaders.
  4. UEFI offers secure boot which can prevent boot-time viruses from loading.




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