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Line 4: A '''master boot record''' ('''MBR''') is a special type of [[boot sector]] at the very beginning of [[disk partitioning\|partitioned]] computer [[mass storage device]]s like [[fixed disk]]s or [[removable drive]]s intended for use with [[IBM PC-compatible]] systems and beyond. The concept of MBRs was publicly introduced in 1983 with [[PC DOS 2.0]]. The MBR holds the information on how the logical partitions, containing [[file ~~system]]s~~systems, are organized on that medium. The MBR also contains executable code to function as a loader for the installed operating system—usually by passing control over to the loader's ~~[[Second-stage boot loader\|~~second stage]], or in conjunction with each partition's [[volume boot record]] (VBR). This MBR code is usually referred to as a [[boot loader]].<ref name="FOLDOC"/> The organization of the partition table in the MBR limits the maximum addressable storage space of a partitioned disk to 2 [[Tebibyte\|TiB]] {{nowrap\|(2<sup>32</sup> × 512 bytes)}}.<ref name="Microsoft_2013_2581408"/> Approaches to slightly raise this limit assuming 32-bit arithmetics or 4096-byte sectors are not officially supported, as they fatally break compatibility with existing boot loaders and most MBR-compliant operating systems and system tools, and can cause serious data corruption when used outside of narrowly controlled system environments. Therefore, the MBR-based partitioning scheme is in the process of being superseded by the [[GUID Partition Table]] (GPT) scheme in new computers. A GPT can coexist with an MBR in order to provide some limited form of backward compatibility for older systems.

Master boot record: Difference between revisions