The Initial Program Loader comprises the second stage bootloader which then loads the operating. The VBR usually contains an Initial Program Loader (IPL) which is the code that initiates the boot process. Disk partition table (16 bytes per partition X 4 partitions) - MBR supports only 4 partitions, more information on this later.Īt this stage, the MBR scans the partition table and loads the Volume Boot Record (VBR) into RAM.
It contains three items that have to fit into this space: The first disk block is the MBR, and it has a size of 512 bytes. Once BIOS has detected the boot device, it reads the first disk block of that device into memory. Detecting and initializing the video card.Before the BIOS can detect the boot device, it goes through a sequence of system configuration functions starting with: The bootloader firmware contains low-level functions such as reading from the keyboard, accessing video display, performing disk I/O and the code to load a first stage bootloader.
Now, BIOS - Basic Input/Output System comprises the bootloader firmware. So if your system is using the MBR partition structure, the first execution process will load the BIOS.
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