MASTER BOOT RECORD,,

MBR is: a very important data structure that contains the partition table and a number ofexecutable code for the boot start (way to hard to make loading the operating system).
functions to store information about the operating system and then be read by the BIOS.

he structure of the hard disk Master Boot Record partition scheme Partitioning schemes Master Boot Record (MBR) (UK: MBR Partition-Style) is a partition scheme that uses the structure of Master Boot Record. In the Master Boot Record, there is a partition table that describes where the partitions are put in the hard disk. This partitioning scheme is only available in the Intel x86 system, and implemented in the system BIOS of the system. In this partitioning scheme, the partition is divided into three types, namely 

Primary Partition: or the primary partition, the partition that can be used to perform the operating system boot process and store user data. There were only four pieces only in a single hard disk. If there is an additional partition, then the amount will be reduced to three primary partitions. 

 Extended Partition: or additional partitions, the partitions that can accommodate multiple logical partitions. This partition is actually one kind of primary partition. The numbers should only be one piece only. 

 Logical Partition: or logical partition, that partition can not be used to make the process of booting the operating system, and can only store user data. Amount is not restricted, meaning that in a single hard disk may have a lot to have its main office logical partition to a single additional partition. 
 functions to store information about the operating system and then be read by the BIOS.