Master Boot Record (MBR)

What is Master Boot Record (MBR)?
The master boot record is a category of boot sectors and the very first sector found in computer mass storage media such as hard drives and removable media.

The master boot record contains information about loading the operating system and also about the partition of the hard disk. The programs contained in the master boot record determine which partition must be used when booting. The master boot record is missing on non-partitioned devices such as super disks, floppy disks, or other devices configured this way.
A master boot record has the following properties: It is always located in the first sector of the hard disk. Cylinder 0, Head 0, Sector 1 is the specific address of the master boot record on the hard disk. It contains information about the organization of the partitions and the file system. A master boot record is generally 512 bytes or more.

Mit Hilfe des Befehls FDISK oder MBR können Benutzer einen Master-Boot-Record in DOS- und Windows-Systemen erstellen. Der Master-Boot-Record kann unabhängig vom Betriebssystem als Chain-Boot loader arbeiten. Die drei Hauptkomponenten des Master-Boot-Records sind die Master-Partitionstabelle, der Master-Boot-Code und die Disk-Signatur. Ein beschädigter Master Boot Record kann in Windows 7 und Windows Vista mit dem Befehl „bootrec“ repariert werden, der in Systemwiederherstellungsoptionen verfügbar ist.

In Windows XP, the repair command is “fixmbr.” One of the newest alternatives to the master boot record is the GUID partition table. It is a component of the uniform upgradeable firmware interface specification.

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