A master boot record (MBR) is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond.

MBR stands for Master Boot Record, and is a bit of reserved space at the beginning of the drive that contains the information about how the partitions are organized. The MBR also contains code to launch the operating system, and it's sometimes called the Boot Loader.

The MBR (Master Boot Record) is a set of information in the very first sector of your bootable system hard drive. It tells the computer where it can find the operating system (or systems) and load it in the memory.

MBR is a boot sector located in a region of a computer hard disk. This sector is responsible for storing information regarding all partitions in the hard drive. Master Boot Record also serves as a loading unit of the operating system in use. An MBR is created the moment you install Windows on an initial partition.

Master Boot Record (MBR) contains the Partition Table for the disk, and a small amount of executable code for the boot start, if it is a boot drive. MBR will be created when the first partition of the hard drive is created, and usually locates on the first sector of the disk.