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A boot sector is the sector of a persistent data storage device which contains machine code to be loaded into random-access memory and then executed by a computer system's built-in firmware.
Usually, the very first sector of the hard disk is the boot sector, regardless of sector size and partitioning flavor.
The purpose of defining one particular sector as the boot sector is inter-operability between firmware and various operating systems.
The purpose of chainloading first a firmware , then some code contained in the boot sector, and then, for example, an operating system, is maximal flexibility.
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