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What is UEFI and What's the Difference With BIOS

BIOS will soon be abandoned: Intel has announced plans to replace it with UEFI on all their chipsets by 2020. Well, what is UEFI, and what's the difference with BIOS that we all know before?

UEFI and BIOS is software low levels that start when you start your PC before booting on your operating system, but UEFI is a more modern solution, supports larger hard drives, faster boot times, more security features, and cursor graphics

Many of today's PCs have started using UEFI and many still call it "BIOS" to avoid confusing people who are familiar with the term BIOS in traditional PCs. Even if your PC uses the term "BIOS", the modern PC you buy today almost certainly uses non-BIOS UEFI firmware. This is the reason.

What is a BIOS?


The BIOS stands for Basic Input-Output System . This is a low-level software that resides in a chip on your computer's motherboard. The BIOS loads when your computer is turned on, and the BIOS is responsible for waking up your computer's hardware components, making sure it functions properly, then running a bootloader running Windows or any other operating system you have installed.

You can configure various settings on the settings screen BIOS. Settings like your computer's hardware configuration, system time, and boot sequence are here. You can access the BIOS by pressing certain keys, different on each computer, but mostly Esc, F2, F10, or Delete when the computer boots. When you save the settings, it will be saved to memory on your own motherboard. When you boot your computer, the BIOS will configure your PC with stored settings.

The BIOS runs via POST, or Power-On Self Test, before booting on your operating system. It checks to make sure your hardware configuration is valid and working properly. If anything goes wrong, you will see an error message or hear a series of beep codes . You should look for a different beep sequence in the computer manual.

When your computer boots-and after the POST-BIOS finishes look for the Master Boot Record, or MBR, stored on the boot device and use it to launch the bootloader.

Why BIOS Start Abandoned

BIOS has been around for a long time, and has not evolved much. Even MS-DOS PCs released in the 1980s used the BIOS!

Of course, the BIOS has evolved and improved over time. Several extensions were developed, including ACPI, Advanced Configuration and Power Interface. This allows the BIOS to more easily configure the device and perform advanced power management functions, such as sleep. But the BIOS has not had a significant advance, almost the same as other PC technologies since the days of MS-DOS.

The traditional BIOS still has serious limitations. It can only boot from a 2.1 TB drive or less. A 3 TB drive is now common, and computers with BIOS can not boot from the drive. The limitations are caused by the workings of the Master Boot Master BIOS system.

The BIOS must run in 16-bit processor mode, and has only 1 MB of space to be executed. It has a problem in initializing multiple hardware devices at once, which causes the boot process to be slower when initializing all interfaces and hardware on modern devices. PC.

BIOS requires replacement for a long time. Intel began working on the Extensible Firmware Interface (EFI) specification in 1998. Apple selected EFI when it switched to Intel architecture on a Mac in 2006, but other PC manufacturers did not follow.

In 2007, Intel, AMD, Microsoft and The PC approves the new Unified Extensible Firmware Interface (UEFI) specification. This is an industry standard managed by the Unified Extended Firmware Interface Forum, and is not driven solely by Intel. UEFI support is introduced to Windows with Windows Vista Service Pack 1 and Windows 7. Most computers you can buy now use UEFI instead of traditional BIOS.

How UEFI Replaces the BIOS Position

There is no way to switch from BIOS to UEFI on an existing PC. You have to buy new hardware that supports UEFI, like most other new computers. Most UEFI implementations provide BIOS emulation so you can choose to install and boot older operating systems that expect BIOS rather than UEFI, so it's compatible with both.

This new standard avoids BIOS limitations. UEFI firmware can boot from a 2.2 TB drive or larger, the theoretical limit is 9.4 zettabytes. That's about three times the approximate size of all the data on the Internet. That's because UEFI uses the GPT partition scheme and not the MBR. It also boots in a more standard way, launching EFI executable files instead of running code from the master boot drive record.

UEFI can run in 32-bit or 64-bit mode and has address space that is more addressable than BIOS, meaning process Your boot is faster. This also means that the UEFI setup screen can be more slick than the BIOS settings screen, including graphic and mouse cursor support. However, this is not mandatory. Many PCs still use the UEFI text-mode setting interface that looks and works like an old BIOS setup screen.

UEFI is packed with other features. It supports Secure Boot, which means the operating system can be checked for validity to ensure no malware is damaging to the boot process. It can support network features right in UEFI's own firmware, which can help troubleshoot and configure remotely. With the traditional BIOS, you have to sit in front of a physical computer to configure it.

UEFI is basically a small operating system that runs on top of PC firmware, and this can do more than just BIOS. UEFI can be stored in flash memory on the motherboard, or it may be loaded from the hard drive or network at boot time.

PCs with UEFI will have different interfaces and features. It's all up to your PC manufacturer, but it's basically the same on every PC.

How to Access UEFI Settings on a Modern PC

If you want to access low-level settings, there may be slight differences. You may need to access the UEFI settings screen via the Windows boot menu option instead of pressing a button while your computer is on. With PCs now booting up fast, PC manufacturers do not want to slow down the boot process by waiting to see if you press a button. However, we also see a PC with UEFI that lets you access the BIOS in the same way, by pressing a button during the boot process.

UEFI is a big change.


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