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Note: The column MBR (Master Boot Record) refers to whether or not the boot loader can be stored in the first sector of a mass storage device. The column VBR (Volume Boot Record) refers to the ability of the boot loader to be stored in the first sector of any partition on a mass storage device.
GNU GRUB (short for GNU GRand Unified Bootloader, commonly referred to as GRUB) is a boot loader package from the GNU Project.GRUB is the reference implementation of the Free Software Foundation's Multiboot Specification, which provides a user the choice to boot one of multiple operating systems installed on a computer or select a specific kernel configuration available on a particular ...
rEFInd is a boot manager for UEFI and EFI-based machines. [2] [3] It can be used to boot multiple operating systems that are installed on a single non-volatile device. It also provides a way to launch UEFI applications. [4] [5] It was forked from discontinued rEFIt in 2012, with 0.2.0 as its first release. [6] [7]
GNU GRUB, a popular open source bootloader Windows Boot Manager. A bootloader, also spelled as boot loader [1] [2] or called bootstrap loader, is a computer program that is responsible for booting a computer. If it also provides an interactive menu with multiple boot choices then it's often called a boot manager. [2]
A type of UEFI application is an OS boot loader such as GRUB, rEFInd, Gummiboot, and Windows Boot Manager, which loads some OS files into memory and executes them. Also, an OS boot loader can provide a user interface to allow the selection of another UEFI application to run.
The second-stage loader (stage2, the /boot/grub/ files) is loaded by the stage1.5 and displays the GRUB startup menu that allows the user to choose an operating system or examine and edit startup parameters. After a menu entry is chosen and optional parameters are given, GRUB loads the linux kernel into memory and passes control to it.
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GNU GRUB is the reference implementation used in the GNU operating system and other operating systems. [3] As of July 2019, the latest version of Multiboot specification is 0.6.96, defined in 2009. [2] An incompatible second iteration with UEFI support, Multiboot2 specification, was later introduced.