Hiding partitions/OSes with boot loader
 

Does anyone know of any software that will run as a boot loader, and restrict other OSes (installed on separate partitions) ability to see each other?

Encryption is a bonus, but the main goal is for this boot loader to point the user to different OS installations - the loaded OS' should have no knowledge or access to the other disk.

I can't think of a better way to word it.. any suggestions?

Do with the grub bootloader. Designate one OS as the controller, or master system; the only one with information on where the other OSs are in it's /boot/grub/menu.lst file.

All other OSs, after installation, edit the /boot/grub/menu.lst or lilo.conf file in each OS to remove reference to other OSs. Also edit /etc/fstab to remove reference to other partitions.

Just because the installations write the config files during installation to include such information, doesn't mean you have to leave that information in place.