Red Hat ENTERPRISE LINUX AS 2.1 Installation Manual page 54

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Figure 3–9 Boot Loader Installation
If you chose to install a boot loader (GRUB or LILO), you must determine where it will be installed.
You may install your boot loader in one of two places:
The master boot record (MBR)
The recommended place to install a boot loader, unless the MBR already starts another operating
system loader, such as System Commander or OS/2's Boot Manager. The MBR is a special area
on your hard drive that is automatically loaded by your computer's BIOS, and is the earliest point
at which the boot loader can take control of the boot process. If you install it in the MBR, when
your machine boots, GRUB (or LILO) will present a boot prompt. You can then boot Red Hat
Enterprise Linux AS or any other operating system that you have configured the boot loader to
boot.
The first sector of your root partition
Recommended if you are already using another boot loader on your system (such as OS/2's Boot
Manager). In this case, your other boot loader will take control first. You can then configure
that boot loader to start GRUB (or LILO), which will then boot Red Hat Enterprise Linux AS.
Chapter 3:Installing Red Hat Enterprise Linux AS