Disk Signature -- MBR

Structure of a master boot record

Address			Description		Size in bytes
Hex	Oct	Dec
0000	0000	0	code area		440 (max. 446)
01B8	0670	440	disk signature (optional)		4
01BC	0674	444	Usually nulls; 0x0000		2
01BE	0676	446	Table of primary partitions (Four 16-byte entries, IBM partition table scheme)		64
01FE	0776	510	55h	MBR signature; 0xAA55	2
01FF	0777	511	AAh
MBR, total size: 446 + 64 + 2 =					512

The Table is from Wiki: http://en.wikipedia.org/wiki/Master_boot_record