Emergency Boot and Forensics Disks:

Emergency Boot CDs will allow you to boot a system which is experiencing problems. These CDs provide a variety of tools for fixing both Linux and Windows based systems. They also provide a number of other useful utilities such as file recovery, disk partitioning, filesystem resizing, file viewers and forensics tools.

Ubuntu Live

Helix Live Forensics

Insert (Inside Security Rescue Toolkit)

Knoppix (the Original Live CD)