The most typical example of a catastrophic failure is a dead boot drive. Let's say you have replaced it with a new, unformatted drive. Now you need to find an alternate boot device, and boot from it. You may want to boot from CD, tape, or the network. Since my example box has a CD, I will try to boot from CD. Insert bootable media into the drive. Note that I am taking the long way, there is a shorter way that (usually) works that I will show you later. Let's find our available boot devices. Type di to redisplay your available options.

Main Menu: Enter command or menu > di

---- Main Menu ---------------------------------------------------------------

     Command                           Description
     -------                           -----------
     BOot [PRI|ALT| path ]             Boot from specified path
     PAth [PRI|ALT] [ path ]           Display or modify a path
     SEArch [DIsplay|IPL] [ path ]     Search for boot devices

     COnfiguration menu                Displays or sets boot values
     INformation menu                  Displays hardware information
     SERvice menu                      Displays service commands

     DIsplay                           Redisplay the current menu
     HElp [ menu | command ]           Display help for menu or command
     RESET                             Restart the system
----
Main Menu: Enter command or menu >