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1 A bootstrap loader is a small program which is held in ROM. 2  The processor executes this code when it gets the reset (or powerup) signal.  The bootstrap loader does a few hardware checks and then causes the processor to load and execute the code in the boot sector of the start-up hard disc.
There are several possible types of boot loaders and ways for the BIOS to obtain them. A. A boot loader stored in the first sector of a hard disk, the Master Boot Record, or MBR. This may be GRUB or LILO or yaboot or others. B. A boot loader stored on some other storage device, such as a CDR or USB flash drive. C. A boot loader which uses the network, such as the Pre-Execution Environment (PXE). This code is normally stored on a ROM on the networking card itself. The need for the initial parts of the bootloader code on the first part of a storage medium explains why some hard drives are 'bootable' and others are not. The job of the boot loader is to begin the next phase, loading the kernel and an initial ram disk filesystem.