The default boot options are adequate for most situations. The
installation program writes the GRUB
boot loader in the
master boot record (MBR), overwriting any
existing boot loader.
You may keep your current boot loader in the MBR
and install GRUB as a secondary boot loader. If you choose this
option, the installer program will write GRUB to the first sector
of the Linux /boot partition.
GRUB as a Secondary Boot Loader
If you install GRUB as a secondary boot loader, you must
reconfigure your primary boot loader whenever you install and
boot from a new kernel. The kernel of an operating system such
as Microsoft Windows does not boot in the same fashion. Most
users therefore use GRUB as the primary boot loader on dual-boot
You may also need the advanced options if your
BIOS enumerates your drives or RAID arrays
differently than Fedora expects. If necessary, select the
Change Device button and expand the
BIOS Drive Order selection within
the Boot loader device dialog to set the order of the
devices in Fedora to match your BIOS.