Partition map format floppy disk1/20/2024 ![]() 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, or in conjunction with each partition's volume boot record (VBR). ![]() The MBR holds the information on how the disc's sectors (aka “blocks”) are divided into partitions, each partition notionally containing a file system. The concept of MBRs was publicly introduced in 1983 with PC DOS 2.0. For the first sector on non-partitioned media, see volume boot record.Ī 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. This article is about an IBM PC-specific type of boot sector on partitioned media.
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