I browsed the Fedora Projects site and found this:
.... To load the rescue system with the
first installation disc, enter:
Specify the language, keyboard layout and network settings for the rescue system with the screens that follow. The final setup screen configures access to the existing system on your computer.
By default, rescue mode attaches an existing operating system to the rescue system under the directory /mnt/sysimage/.
Found this from: http://fedora.redhat.com/docs/fedora...sn-mode-rescue