What is BIOS? What is it used for? Differences between BIOS and UEFI

BIOS/UEFI are a main element to be able to use any computer. They are responsible, among other things, for loading the operating system into RAM. In this article we will teach you what is bios and uefi, the differences between bios and uefi, how to accessing them, etc... If you want to know more about them, continue reading the article.

What is BIOS?

The BIOS is a firmware that scans and recognizes the devices needed to load the operating system into RAM.

In the old day, BIOS was stored in ROM memories, which contains special programs that allow the operating system to be started. These memories had the characteristic that once information was introduced, it was not possible to modify it again.

Subsequently, the PROM appeared, in which it was possible to modify the information only once.

Then appeared EPROM memories, which allow clear its contents being exposed to UV light.

Later, with EEPROM memories, information could be erased electrically without problems. Today the BIOS configuration is stored on a chip called CMOS, which consumes very little power and is constantly powered by a small stack.

Differences between BIOS and UEFI

difference between bios and uefi
Image credits to: https://como-funciona.com

UEFI succeeded the BIOS by implementing functions that improved it aesthetically and functionally, but UEFI is, like BIOS, a firmware that allows the operating system to be booted. Now I show you some of the differences between BIOS and UEFI:

  1. One of the most notable differences between BIOS and UEFI is the interface. UEFI has a more modern and aesthetic interface and which can use the mouse, while one of the BIOS features It has a very simple interface, tawdry and even scroll through the different options you have to use the thecae direction.
  2. The UEFI, which uses 32 or 64 bit, unlike the BIOS uses only 16 bitsIt allows the computer to boot the operating system faster.
  3. UEFI has the ability to activate the boot safe mode or boot Secure. This allows suspicious operating systems to not run during startup, which may be viruses or other programs that may harm Windows security. If you plan to install another operating system, you may need to disable safe mode, as it can cause boot problems, because secure boot option can confuse the new operating system with malware.
  4. BIOS has MBR partitioning scheme, so that can support drives up to 2,2Tb. Thanks to the GPT partition scheme that uses UEFI, we can include drives up to 9,4 zettabytes, Those which have not yet created.

How to enter the BIOS?

To access the BIOS you will have to press a certain key while your computer starts. The key to press depends on the model of your motherboard manufacturer. I am doing this article with a laptop do, in which I have to press the F2 key after turning on the computer. The F2, F10, or Delete buttons are usually F2, F10, or Delete buttons. You can also access the bios from windows 10 pressing the SHIFT + Restart key.

Is it good to update the BIOS?

Undoubtedly. Updating the BIOS from time to time is the best you can do to your computer, as it will help you to have better recognition and compatibility of the hardware devices that you have connected to your computer's motherboard.

How to update the BIOS of my PC?

Another very common question is "how to update the BIOS” or “how to update the UEFI". Well, updating the BIOS or UEFI is very simple. Simply search the Internet for the model of your motherboard (to know it you can open your computer or laptop or install one of the many free softwares that show you. Aida 64 is an example) and search, preferably on the official page of the board manufacturer, the latest version of BIOS or UEFI available.


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