UEFI, what it is and how it compares to your computer’s BIOS

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In addition to the components you know, such as RAM, processor, hard drive, battery, graphics card, etc., computers need an internal system whose code contains the instructions needed to make a you safe boot and that puts the point of the team.

For this, the BIOS was created, which since 1975 has been in charge of starting the hardware and the software on desktop computers and laptops.

Specifically, this system is a low-level program that resides on a chip on the computer’s motherboard. It is responsible for starting the operating system, as well as performing tasks such as identifying components and setting the system time.

This is the ingredient that goes unnoticed, but essentially, sets the stage for your experience to begin smoothly. However, as we moved into the 1990s, major technology companies noticed that the BIOS code was becoming obsolete.

Due to the demands of new PC designs, that’s it UEFI, the successor to BIOS to make a change from head to toe.

In 2015, a conglomerate of technology companies, including Intel, AMD, Dell, Lenovo, and Microsoft, came together to form the UEFI Foundation.

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This project arose to develop a vitamin and improved BIOS, more secure, faster and able to support hard drives larger than 2 TB. Quickly, this code became the answer to the need for a startup system that could fulfill today’s needs.

UEFI has become the de facto standard for modern computers. In fact, most models sold today use this code instead of BIOS, but there is a lot of confusion among users.

Main differences between UEFI and BIOS

The transition to BIOS and UEFI caused dramatic changes in how modern computers start and operate.

From its origin as a classic BIOS to becoming the advanced UEFI, these internal systems play an important role in the smooth and secure deployment of computers. Here we share a list of important differences between BIOS and UEFI:

Bootability and architecture

  • BIOS: Runs in 16-bit mode, limiting boot speed.
  • UEFI: Can run in 32-bit or 64-bit mode, allowing faster boot times.
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Graphical interface

  • BIOS: Traditionally text-based, with settings adjusted using specific keys. It does not support graphical interfaces or mouse cursors.
  • UEFI: Offers more modern and friendly graphical interfaces. It can interact with a mouse, providing a more intuitive user experience.

Support for higher capacity hard drives

  • BIOS: Limited to MBR partition scheme, limit the size of hard drives to 2.2TB.
  • UEFI: Uses the GPT partitioning scheme, removing the size restriction and allowing hard drives larger than 2TB capacity.


  • BIOS: Lacks advanced security features, making it more susceptible to threats such as malware during the boot process.
  • UEFI: It has a secure boot, which verifies the validity of the operating system and prevents the execution of unauthorized code during startup.

Integrated Network Capabilities

  • BIOS: Does not include networking functionality directly in the firmware.
  • UEFI: Provides support for network functions, making it easy to configure and troubleshoot remotely.

Storage settings

  • BIOS: Uses battery-backed CMOS memory to store settings.
  • UEFI: Can be stored in motherboard flash memory or loaded from hard drive or network share during boot.
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Backward Compatibility

  • BIOS: Traditionally more resistant to changes and updates, with limited compatibility with newer operating systems.
  • UEFI: Provides BIOS emulation, allowing installation and booting of older operating systems.

Continuous development and support

  • BIOS: Its development is static, with limited updates, so there is no active participation in the industry.
  • UEFI: In 2015, the UEFI foundation was formed with the collaboration of 140 companies, showing a more dynamic and collaborative approach. This leads to continuous improvement and more frequent updates.

Switching from BIOS to UEFI is not a simple matter of nomenclature; This is a radical change in the way computers start and operate.

UEFI has improved in all aspects, from boot speed to security and user interface. Thanks to this technology, PCs can better meet today’s needs and challenges.

The main difference between the two systems is that the latter offers several advantages over BIOS such as support for larger hard drives, high support, storage configuration and increased network capacity.