The Master Boot Record(MBR),created when the first partition is created on a hard disk,is located in the drive's first logical sector.The MBR contains the following:
。The disk partition table,which describes the sizes and locations of all partitions on the disk.
。A small program that locates the partition's boot sector and transfers control to a program in the sector that loads the operating system.
Each formatted partition is represented by a separate drive letter such as C,D,or E.