What is BIOS Legacy and UEFI boot mode | Go my class

Boot Mode

Friends, as in the previous post, you guys read / learned about the booting process. In this post we will learn about booting mode.

BIOS has two user interfaces in the computer. First Legacy mode and second UEFI mode. Legacy boot mode is used only with older hardware components and UEFI boot mode is used with newer and older hardware components. That is, UEFI is an upgrade and advanced version of the legacy boot mode.

What is BIOS/Legacy boot mode?

The full name of bios is basic input output system. It is also called Legacy Boot Mode. It has CUI (Character User Interface). This is a low level software, which is stored in the chip of the motherboard. When the computer is turned on, the BIOS passes through a post (Power on Self Test) before booting your operating system. Which checks all the hardware devices connected to the computer whether all the hardware devices are working properly or not. When the post process is completed. The BIOS then reads a Master Boot Record (MBR). Which is stored in the boot device. The bootloader is launched using the MBR. After that boots the operating system in the computer.

• Bios works only in 16 bit mode.

• It can only boot drives up to 2.1 TB.

• Bios was also used in MS-DOS computers in the 1980s.

What is UEFI boot mode?

The full name of UEFI is Unified Extensible Firmware Interface. UEFI is a type of user interface for managing the boot process in computer systems. It is developed by Intel. It can be called an advanced version of Bios. UEFI is GUI (Graphical User Interface). Which supports the mouse cursor. UEFI, like the BIOS, serves to connect the computer's operating system and its firmware. When the computer turned on, UEFI checks all hardware components connected to the computer and boots the operating system. All its information and settings are stored in the EFI system partition of the hard disk as .efi. It supports both 32 bit and 64 bit mode. It supports modern and older computer systems and hardware. The performance of UEFI is higher than that of the Bios (Legacy) mode. UEFI can read both GPT and MBR files. UEFI is low level software that boots before the operating system. UEFI is a modern technology that supports large hard drives and boots very fast.

• UEFI can boot drives from 2.2 TB to 9.4 Zetta bytes.

• UEFI can run in both 32bit and 64bit mode.

• It has more address space than BIOS, due to which UEFI boots faster.

• UEFI also provides security boot feature. It allows loading only authentic drivers and services at the time of booting. So that no malware can be loaded when the computer is turned on.