UEFIkäynnistys

UEFIkäynnistys refers to the process of booting a computer system using the Unified Extensible Firmware Interface (UEFI) instead of the traditional BIOS. UEFI is a modern firmware interface that acts as an intermediary between the operating system and the computer's hardware during the boot process. It offers several advantages over BIOS, including faster boot times, support for larger hard drives, enhanced security features, and a more user-friendly graphical interface.

When a computer with UEFI firmware starts, it initializes the hardware and then loads the UEFI boot manager. This boot manager then locates and loads the bootloader from a designated EFI System Partition (ESP) on the storage device. The bootloader, which is typically part of the operating system installation, takes over and loads the operating system kernel into memory. This process is more modular and flexible than the BIOS chain-loading method.

UEFI also supports features like Secure Boot, which helps protect against malware by ensuring that only trusted software is loaded during startup. The graphical nature of many UEFI interfaces allows for easier navigation and configuration of boot settings, driver updates, and other system-level options compared to the text-based BIOS screens. Most modern computers manufactured in the last decade utilize UEFI as their default firmware.