Linux Live CDs
I don't know about you but I keep live cds in my tool kit. They are a useful tool to explore drives, test equiptment, make a temporary firewall, and much more.
The author on Darknet has posted the
10 Best Live CD Distros. I happen to keep 7 out of the 10 in my toolkit for use. I end up using Auditor on compromised systems to analyze them before destroying the contents of the drive. If you don't have any of these in your toolkit, I recommend you getting at least one.