MBR is also sometimes referred to as the master boot block and master partition boot sector. the MBR is the first sector of the computer hard disk drive that tells the computer how to load the operating system, how the hard drive is partitioned, and how to load the operating systems.
in the above picture, is an example of what a partitioned hard disk drive my look like. in this case, the MBR is the first section of the hard disk drive the computer looks at after the BIOS hands control to the first bootable drive. unlike the VBR, there is always only going to be a maximum of one MBR on a partitioned hard drive.
The MBR is also susceptible to boot sector viruses that can corrupt ro remove the MBR, which can leave the hard drive unusable and prevent the computer from booting up. for example, the stone empire monkey virus is an example a MBR virus.
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