What is the difference between legacy and uefi

The difference between legacy and uefi: 1. uefi is a new BIOS, and legacy is a traditional BIOS; 2. The system installed in legacy mode can only enter the system in legacy mode. uefi only supports 64 bits. The system and disk partition must be in gpt mode.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

The difference between legacy and uefi:

uefi is a new BIOS, and legacy is a traditional BIOS. The system you install in UEFI mode can only be booted in UEFI mode. Similarly, if you install the system in Legacy mode, you can only enter the system in Legacy mode. uefi only supports 64-bit systems and the disk partition must be in gpt mode. Traditional BIOS uses Int 13 interrupt to read the disk, which can only read 64KB at a time, which is very inefficient. However, UEFI can read 1MB at a time and load faster. In addition, Win8 has further optimized UEFI support, claiming to be able to achieve instant boot.

New UEFI, full name "Unified Extensible Firmware Interface" (Unified Extensible Firmware Interface), is a standard that describes a type of interface in detail. This interface is used by the operating system to automatically load an operating system from a pre-boot operating environment.

Extensible Firmware Interface (EFI) is Intel’s proposed standard for PC firmware architecture, interfaces and services. Its main purpose is to provide a set of consistent and correctly specified boot services on all platforms before the OS is loaded (before booting). It is regarded as the successor of the BIOS with a history of nearly 20 years. UEFI was developed based on EFI1.10. Its owner is no longer Intel, but an international organization called Unified EFI Form.

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