UEFI is an upgrade alternative to BIOS. Regarding the comparison between BIOS and UEFI, if we only compare it in terms of system startup principles, the reason why UEFI is more powerful than BIOS is because UEFI itself is equivalent to a micro operating system, and the convenience it brings is:

First of all, UEFI already has file system support, and it can directly read files in the FAT partition. What is a file system? Simply put, the file system is a method for the operating system to organize and manage files. To put it bluntly, it presents the data on the hard disk to the user in the form of files. Fat32 and NTFS are common file system types.

Secondly, applications can be developed that run directly under UEFI. Such program files usually end with efi. Since UEFI can directly identify files in the FAT partition, there are applications that can run directly in it. Then you can completely make the Windows installation program into an efi type application, and then put it into any fat partition and run it directly. In this way, installing the Windows operating system, which seemed a little complicated in the past, suddenly becomes very simple. Now, it’s as easy as opening QQ under Windows. In fact, that's exactly what happened.

Finally, you must know that these are things that BIOS cannot do. Because before starting the operating system under the BIOS, the system startup code (contained in the master boot record) must be read from the specified sector on the hard disk, and then the operating system must be booted from the active partition. The operation of sectors is far less intuitive and simpler than the operation of files in partitions. Therefore, when booting and installing the Windows operating system under the BIOS, we have to use some tools to configure the device to meet the startup requirements. Under UEFI, none of these are needed. There is no need for a master boot record, an active partition, or any tools. Just copy the installation file to a FAT32 (main) partition/U disk, and then download it from this partition/ Booting from the USB disk and installing Windows is that simple. There will be a special article later to introduce in detail how to install Windows 7 and 8 under UEFI.