Master Boot Record

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 Master Boot Record:


                                   a hard disk must have a consistent starting point where key information is stored about the disk .The information  includes the number of partitions and their types. Another place is required where BLOS can load initial  boot program that starts the process of loading the operating system. The place where this information is stored is called master boot record.. It is also known as master boot sector.

           

              The master boot record is always located at cylinder 0 head 0 and sector 1. This is the consistent starting point that is used by the disk. When a computer starts and BLOS boot the computer . it will always look at the first sector for instructions for proceeding the boot process and loading the  operating system.


    Structures of master boot record:


                                                          The master boot record contains the following structures.


    Master partition Table:


                                                        The master partition table contains a complete of partition on hard disk. The master partition table can store the description of four partitions. It means that a hard disk may only have four partitions known as primary or physical partitions Any additional partitions must be logical partitions that are linked to any primary partitions. One partition is marked as active. The active partition is used by the computer to perform the boot process.


Master Boot Code:

                                              The master boot record is the code that is loaded and executed by BIOS to start the boot process. The code transfers the control the boot program stored on the boot (active) partition to load the operating system.

               The information stored in the master boot record is very important. A serious data loss may occur if it is damaged or corrupted. the master boot code is the first program executed when the computer is turned on.


              



                             operating system:

                                         coming soon..........

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