BIOS vs. UEFI

Before one gets into work with the Windows, there are several steps taken to boot (technical term for load) Windows Operating System(OS).

The loading of any OS and the system resources like display monitors, USB Controllers, CD Drives, Hard Disk Drives(HDD) and several others are handled and configured by a frimware. This frimware is provided by your PC or Desktop manufacturer and it depends in who it is, DELL, HP, ASUS or any other manufacturer. This frimware has undergone several changes overtime and now stands as 2 main types. This article addresses this issue. Let's not get into the years and chronology. Let's boot-in.


BIOS and UEFI are two firmware interfaces for computers to start the operating system. BIOS uses the Master Boot Record (MBR) to save information about the hard drive data while UEFI uses the GUID partition table (GPT). Compared with BIOS, UEFI is more powerful and has more advanced features.

BIOS stand for Basic Input Output System. It's a legacy system, that is, it's old fashioned but is still in use. It has only a CUI and can be operated only by keys of keyboard. No mouse allowed. 


UEFI stands for Unified Extensible Frimware Interface. It's the new one. It has a GUI. It's operated by keyboard as well as mouse. UEFI is also known as UEFI BIOS or EFI BIOS.

Nowadays, BIOS and UEFI are used in a combined manner. This is due to the fact that only recent OSes like Windows 8.1 and above can be installed in UEFI mode. However, they are backwards compatible. But earlier versions are not. Simply put, OSes installed via UEFI mode can be accessed using BIOS but OSes installed using BIOS can't load properly using UEFI.

That's it.


There are some terms in the article which may need some elaboration. The same will be covered in later articles. 


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