Boot sector

A boot sector is the sector of a persistent data storage device (e.g. hard disk, floppy disk, optical disc, etc.) which contains machine code to be loaded into random-access memory (RAM) and then executed by a computer system's built-in firmware (e.g. the BIOS, Das U-Boot, etc.). A boot sector is the sector of a persistent data storage device (e.g. hard disk, floppy disk, optical disc, etc.) which contains machine code to be loaded into random-access memory (RAM) and then executed by a computer system's built-in firmware (e.g. the BIOS, Das U-Boot, etc.).