#VCP ## BIOS Generally BIOS is considered legacy, usually when we talk about the BIOS of a newer system we mean UEFI. For windows it runs on MBR partitions. ## Unified Extensible Firmware Interface (UEFI) Interface between the operating system and the firmware. Runs on GPT disks. UEFI allows for secureboot for your VMs and ESXi hosts. UEFI stores all information about the startup in a .efi file, which is stored on a EFI System partition (ESP). Default Firmware for creating windows machine since W10/Server2016 is EFI, BIOS is depreceated. ## Advantages UEFI over BIOS - 32bit/64bit processors instead of 16 bit(BIOS) - faster boot times - UEFI initializes hardware components in parralel - BIOS initializes hardware components in sequence - large disk support - BIOS was designed for computers with disk drives of 2 TB or less - UEFI was designed to support larger disks - Secureboot - only UEFI supports secure boot, it ensures only trusted software can boot on the computer - Multiple OS support - UEFI allows users to install multiple loaders in the same EFI system partition - BIOS allows only for one loader - Graphics support - UEFI provides advanced graphics support and GUI during boot and in setup - BIOS does not support any graphical interface - Flexibility - UEFI offers more customization than BIOS ## 🔗Resources