Difference between BIOS and UEFI Skip to main content

Difference between BIOS and UEFI

The BIOS and UEFI are both low level softwares that are initialized the moment when the Power is turned ON. Both of them are located on a motherboard chip. Basically BIOS(Basic Input Output System) and UEFI(Unified Extensible Firmware Interface) are the firmware of motherboard that carries out POST (Power On Self Test).
But UEFI is a modern firmware that supports large hard drives,enhanced boot time, more security features, GUI enabled setup screen.

BIOS works in 16 bit processor mode and has only 1 MB of space to execute its operations and thus it founds trouble in initialising all the hardware connected to the computer in the minimum time. This is the real reason behind slow booting of systems installed with BIOS firmaware in use. Also BIOS supports MBR partitioned Hard drives which does not allow hard drive size beyond 2TB and not more than four primary partitions.
Read further on MBR and GPT.

So, whats great with UEFI?

Implementation of UEFI wipes out all the limitations of BIOS.
It operates in 32 bit or 64 bit processor mode and hence it carries out POST operation and launching of bootloader very fast.
It boots by launching EFI executables rather than launching code from Master Boot Record of drive.
UEFI supports GPT partition scheme of hard drive only.

After few years almost all the PC motherboard will be shipping with UEFI only. Also Intel has announced plans to completely replace it with UEFI on all their chipsets by 2020. Read further on uefi.org  website.

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