Unlike BIOS, which simply executes code in a disk's first sector, UEFI understands filesystems (primarily FAT32) and searches for specific files: UEFI boot explained (for Linux users)
: The Secure Boot feature verifies digital signatures for bootloaders and drivers, preventing rootkits and unauthorized code from executing during startup. UEFI Boot
: UEFI can initialize hardware in parallel rather than sequentially, and it directly interacts with the OS, reducing the time from power-on to the login screen. Unlike BIOS, which simply executes code in a
Unified Extensible Firmware Interface (UEFI) boot is the modern standard for starting up a computer, essentially acting as a "mini-operating system" that bridges the gap between hardware firmware and the main operating system. It was developed to replace the aging BIOS (Basic Input/Output System), which had been the standard since the early 1980s but struggled with the demands of modern hardware. Core Advantages Over Legacy BIOS It was developed to replace the aging BIOS
The shift from BIOS to UEFI introduced several critical improvements: