![]() ![]() There's some sort of priority system that decides what file to boot from if there are multiple options, but I don't really know how that works. If the system the hard drive is on is compatible with EFI, it will first look into that EFI partition and find a boot file to load an OS. Inside this, operating systems that support GPT/EFI place their boot files. UEFI presents itself in the form of a small FAT32 partition at the very beginning of the hard drive. Hard drives using GPT are compatible with EFI. There is one difference that is very important to your question, though, and that is (U)EFI. ![]() (For a more in-depth explanation of the differences: ) However, for normal purposes, the two aren't vastly different. GPT has more features and is generally more useful than MBR. ![]() This is a newer standard than MBR, although it essentially does the same thing. This was explained above, so I think I can leave it at that. You see, there are actually at least two different ways a hard drive might be set up: Where is MBR (GRUB) located, it's inside a partition? (Not the best summary, but it should do for now) GRUB is a bootloader, which scans for installed operating systems and presents them in a list to choose among. 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.Ī shorter version: MBR is the info on a hard drive that tells the BIOS of the computer what to boot. In turn, that record contains a program that loads the rest of the operating system into RAM.Ī boot loader package from the GNU Project. In addition to this table, the MBR also includes a program that reads the boot sector record of the partition containing the operating system to be booted into RAM. The Master Boot Record is also sometimes called the "partition sector" or the "master partition table" because it includes a table that locates each partition that the hard disk has been formatted into. The information in the first sector of any hard disk or diskette that identifies how and where an operating system is located so that it can be boot (loaded) into the computer's main storage or random access memory. This question isn't quite as simple as you may think.įirst off, MBR and GRUB aren't the same thing. ![]()
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