A boot sector (sometimes called a bootblock) is a sector of a hard disk, floppy disk, or similar data storage device that contains code for bootingprograms (usually, but not necessarily, operating systems) stored in other parts of the disk.The term boot sector is used for IBM-compatible PCs, whereas bootblock is used when referring to certain other types of computers, such as Sun systems.The BIOS selects a boot device, then it copies the first sector from the device (which may be an MBR, VBR or any executable code), to address location 0x7C00.
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