This code, when fully executed, transfers control to the boot program stored on the boot (active) partition to load the operating system.

Master Boot Code: The master boot record is the small bit of computer code that the BIOS loads and executes to start the boot process.

One of these partitions is marked asĪctive, indicating that it is the one that the computer should used to continue the boot process. Any additional partitions must be logical partitions that are linked to (or are part of) one of the primary partitions.

Partitions, also called primary or physical partitions. For this reason, and no other, a hard disk may only have four true Master partition table, they left just enough room for the description of four partitions, hence the four partition (four physical partitions) limit. When the developers designed the size of this

Master Partition Table: This small bit of code that is referred to as a table contains a complete description of the partitions that are contained on the hard disk.

The master boot record contains the following structures: Will always look at this first sector for instructions and information on how to proceed with the boot process and load the operating system. When a computer starts and the BIOS boots the machine, it This is the consistent starting point that the disk will always use. The master boot record is always located at cylinder 0, head 0, and sector 1, the first sector on the disk. Do not confuse the master boot sector with volume boot sectors, which are indeed different. The place where this information is stored is called the master boot record ( MBR), also referred to as the master boot sector or even just theīoot sector. Initial boot program that starts the process of loading the operating system. There also must be someplace where the BIOS can load the

Similarly, every hard disk must have a consistent 'starting point' where key information is stored about the disk, such as the number of partitions and what type they are. On, always starts executing at the same place, FFFF0h. ToĮnsure that the PC will always boot regardless of the BIOS code, both chip and BIOS manufacturers developed their code so that the processor, once turned But, since the system memory is empty, the processor doesn't really have anything to execute, or even begin to know where to look for it. When you turn on your PC, the processor attempts to begin the process of processing data. Why it is Necessary? If you have arrived here through a search engine, and there's no menu to the left click here! The Master Boot Record (MBR) and What it Does

No active partition found