Both BIOS and UEFI are types of firmware for computers.
BIOS-style firmware is (mostly) only ever found on IBM PC compatible computers.
UEFI is meant to be more generic, and can be found on systems which are not in the ‘IBM PC compatible’ class.
BIOS is not a generic term for all PC firmware, it is a particular type of PC firmware. Your computer has a firmware. If it’s an IBM PC compatible computer, it’s almost certainly either a BIOS or a UEFI firmware.
An operating system that can be booted from a (U)EFI is called a (U)EFI-aware OS, defined by (U)EFI specification.
In addition to the standard PC disk partition scheme, which uses a master boot record (MBR), UEFI works with a new partitioning scheme: GUID Partition Table (GPT). GPT is free from many of the limitations of MBR. In particular, the MBR limits on the number and size of disk partitions (up to 4 primary partitions per disk, up to 2 TB (2 × 240 bytes) per disk) are relaxed.[23] GPT allows for a maximum disk and partition size of 8 ZB (8 × 270 bytes).
How to check if my system is on BIOS or UEFI.
The easiest way is to check to see if
http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
http://www.slashroot.in/linux-booting-process-step-step-tutorial-understanding-linux-boot-sequence
http://wiki.openwrt.org/doc/techref/bootloader
https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/
BIOS-style firmware is (mostly) only ever found on IBM PC compatible computers.
UEFI is meant to be more generic, and can be found on systems which are not in the ‘IBM PC compatible’ class.
BIOS is not a generic term for all PC firmware, it is a particular type of PC firmware. Your computer has a firmware. If it’s an IBM PC compatible computer, it’s almost certainly either a BIOS or a UEFI firmware.
An operating system that can be booted from a (U)EFI is called a (U)EFI-aware OS, defined by (U)EFI specification.
In addition to the standard PC disk partition scheme, which uses a master boot record (MBR), UEFI works with a new partitioning scheme: GUID Partition Table (GPT). GPT is free from many of the limitations of MBR. In particular, the MBR limits on the number and size of disk partitions (up to 4 primary partitions per disk, up to 2 TB (2 × 240 bytes) per disk) are relaxed.[23] GPT allows for a maximum disk and partition size of 8 ZB (8 × 270 bytes).
How to check if my system is on BIOS or UEFI.
The easiest way is to check to see if
/sys/firmware/efi exists. It does not appear if you booted using traditional BIOS.#!/bin/bash
[ -d /sys/firmware/efi ] && echo UEFI || echo BIOShttp://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
http://www.slashroot.in/linux-booting-process-step-step-tutorial-understanding-linux-boot-sequence
http://wiki.openwrt.org/doc/techref/bootloader
https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/
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