• Written in,,,, (x86 port) and (through chainloading),,,,, and Available in and others version 3 Website GNU GRUB (short for GNU GRand Unified Bootloader) is a package from the. GRUB is the of the 's, which provides a user the choice to boot one of multiple installed on a computer or select a specific configuration available on a particular operating system's partitions. GNU GRUB was developed from a package called the Grand Unified Bootloader (a play on ). It is predominantly used for systems. The uses GNU GRUB as its boot loader, as do most and the on x86 systems, starting with the Solaris 10 1/06 release.
See also: When a computer is turned on, finds the configured primary bootable device (usually the computer's hard disk) and loads and executes the initial program from the (MBR). The MBR is the first of the hard disk, with zero as its (sectors counting starts at zero).