Symantec Recovery Disk
A graphical, secondary boot environment (or operating system) that gives you the minimal functionality needed to access recovery points on your network and restore them. This environment is typically used when a drive cannot be restored from within Windows or when the computer has suffered a catastrophic failure and you need to restore the entire hard drive.
The product CD is used both to install the software and to boot a computer into the recovery environment, known as Symantec Recovery Disk. Be sure you store the CD in a safe place.