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Together with the optional disk signature (four bytes) and disk timestamp (six bytes), this leaves between 434 and 446 bytes available for the machine code of a boot loader. The legacy MBR partition table supports a maximum of four partitions and occupies 64 bytes, combined. As of October 2013, such hard disks are still accessed in 512-byte sectors, by utilizing the 512e emulation. For a long time, the size of a sector has been 512 bytes, but since 2009 there are hard disks available with a sector size of 4096 bytes, called Advanced Format disks. The MBR is the first sector of the hard disk, with zero as its offset (sectors counting starts at zero). When a computer is turned on, BIOS finds the configured primary bootable device (usually the computer's hard disk) and loads and executes the initial bootstrap program from the master boot record (MBR). The GNU operating system uses GNU GRUB as its boot loader, as do most Linux distributions and the Solaris operating system on x86 systems, starting with the Solaris 10 1/06 release. It is predominantly used for Unix-like systems. GNU GRUB was developed from a package called the Grand Unified Bootloader (a play on Grand Unified Theory ).
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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 operating system's partitions. GNU GRUB (short for GNU GRand Unified Bootloader, commonly referred to as GRUB) is a boot loader package from the GNU Project. Linux, macOS, BSD, ( Solaris/ illumos (x86 port)), and Windows (through chainloading) In these scenarios, you can use Super Grub2 Disk to quickly boot into any operating system installed.
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Super Grub2 Disk is a really useful rescue disk that can save you from all the trouble caused when the bootloader entries go corrupt or are wiped when you try to install Linux in Windows, rendering the computer unbootable. You can choose the special options to load these drivers, enable the LVM and RAID support in GRUB to ensure that it searches all the connected storage drives. For this reason, Super Grub2 Disk comes with some of the common disk drivers.
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If it is not able to display the operating system entries that you were looking for, then it could be because of some specific drivers needed to access your hard drive. You can pick any of these options to boot into the respective operating system or run the respective tool. It is able to detect Linux, FreeBSD, Mac, Windows and other supported operating systems. After scan is complete, it will show you all the entries found in any boot files or GRUB configuration files etc. This will make it look for all the various boot options available depending on the operating systems installed on your system.

When you boot your system using this rescue disk, it will show a GRUB menu from where you can select Detect and show boot methods. You can burn it on a blank CD or create a bootable USB drive using a tool like Rufus. The ISO image file for Super Grub2 Disk is only 20MB. For this, you can use Super Grub2 Disk which is a very small sized rescue disk specially designed to detect all the operating systems installed on a PC and help you boot into them. Because of GRUB’s remarkable ability to detect various operating systems on different partitions, it can be used to boot into your computer even when regular boot fails due to corruption of bootloader settings. Usually, Linux installs GRUB on your computer so that you can boot into Linux and Windows through it. Most people have their first taste of GRUB bootloader when they try to install Linux alongside Windows in dual-boot mode. The newest version of GRUB is 2.02 and is created by GNU. GRUB is a multi-boot bootloader that can be used to boot into many different operating systems.
