MBR has various meanings in the Governmental & Military category. Discover the full forms, definitions, and usage contexts of MBR in Governmental & Military.
Master Boot Record The first sector of the first hard disk; a physically small but critical element in the startup process on an x86-based computer. When a computer is booted, it processes a series of self-tests and then reads the Master Boot Record, or MBR, into memory. The MBR contains instructions that locate the disk’s system (startup) partition, read the contents of the first sector of the system partition into memory, and then carry out the instructions contained in that sector.
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