Boot Sequence: Difference between revisions
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== Master Boot Record ==
The (legacy) BIOS checks bootable devices for a boot signature, a so called magic number.
Execution is then transferred to the freshly loaded boot record. On a floppy disk, all 512 bytes of the boot record may contain executable code. On a hard drive, the [[MBR (x86)|Master Boot Record]] (MBR) holds executable code at offset 0x0000 - 0x01bd, followed by table entries for the four [[Partition Table|primary partitions]], using sixteen bytes per entry (0x01be - 0x01fd), and the two-byte signature (0x01fe - 0x01ff).
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