For starters, MBR only works with disks up to 2 TB in size.

If you have Linux installed, the GRUB boot loader will typically be located in the MBR.

If you have Windows installed, the initial bits of the Windows boot loader reside here-that’s why you may have to repair your MBR if it’s overwritten and Windows won’t start. The boot loader is a small bit of code that generally loads the larger boot loader from another partition on a drive. This sector contains a boot loader for the installed operating system and information about the drive’s logical partitions. MBR was first introduced with IBM PC DOS 2.0 in 1983. It’s called Master Boot Record because the MBR is a special boot sector located at the beginning of a drive. RELATED: What Is the System Reserved Partition and Can You Delete It? MBR’s Limitations This is why you have to choose MBR or GPT before creating partitions on a drive. This information includes where partitions begin and end on the physical disk, so your operating system knows which sectors belong to each partition and which partition is bootable. MBR (Master Boot Record) and GPT (GUID Partition Table) are two different ways of storing the partitioning information on a drive.

You have to partition a disk drive before you can use it.

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