Drivers: UEFI has intricate yet discrete drivers, while BIOS uses drivers in option ROM (read-only memory).UEFI’s theoretical size limit for bootable drives is more than nine zettabytes, while BIOS can only boot from drives 2.2 terabytes or smaller. Drives: UEFI supports larger HDDs and SDDs.Languages: BIOS is written in assembler, while UEFI is written in simpler C-language.UEFI provides the following functionality and advantages:
( More on difference between MBR and GPT). Each partition can only be a maximum of 2TB in size, while GPT uses 64-bit entries in its table which dramatically extends the support for size possibilities of the hard drive. The major difference between the two is that MBR uses 32-bit entries in its table which limits the total physical partitions to only 4. Breaking out of size limitationsīIOS uses the Master Boot Record (MBR) to save information about the hard drive data while UEFI uses the GUID partition table (GPT). Some of those features are discussed below. UEFI is meant to completely replace BIOS and bring in many new features and enhancements that can’t be implemented through BIOS. The ESP partition also contains the boot loader programs for the Operating System installed on the computer. This file is stored on the hard drive inside a special partition called EFI System Partition (ESP). It stores all the information about initialization and startup in an. UEFI (Unified Extensible Firmware Interface) does the same task a little differently. Since BIOS has been in use since the very beginning (it exists since the MS-DOS era), it still works in 16-bit mode, limiting the amount of code that can be read and executed from the firmware ROM. BIOS also selects the boot device that needs to be initialized for starting the operating system. BIOS (Basic Input Output System) works by reading the first sector of the hard drive which has the next device’s address to initialize or code to execute.
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