What is boot sector?

  • A boot sector or boot block is a region of a hard disk, floppy disk, optical disc, or other data storage device that contains machine code to be loaded into random-access memory (RAM) by a computer system's built-in firmware.
  • What is MBR (Master Boot Record)?
    • A Master Boot Record (MBR) is the first sector of a data storage device that has been partitioned. The MBR sector may contain code to locate the active partition and invoke its Volume Boot Record.
  • What is VBR (Volume Boot Record)?
    • A Volume Boot Record (VBR) is the first sector of a data storage device that has not been partitioned, or the first sector of an individual partition on a data storage device that has been partitioned. It may contain code to load an operating system (or other standalone program) installed on that device or within that partition.
    • The Volume Boot Record (VBR) is the first sector of individual partition which contains partition information at the beginning of each partition.

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