: While BIOS is limited to the Master Boot Record (MBR) scheme (maxing out at 2TB and 4 primary partitions), UEFI uses the GUID Partition Table (GPT) to support drives up to 9.4 zettabytes and up to 128 partitions.
: 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. UEFI Boot
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) : While BIOS is limited to the Master
: The Secure Boot feature verifies digital signatures for bootloaders and drivers, preventing rootkits and unauthorized code from executing during startup. The shift from BIOS to UEFI introduced several
The shift from BIOS to UEFI introduced several critical improvements: