I'm flogging off all the old PC's at work and understandably, I'd like to zero out all the HD's. Now, I know I can do this with a live CD and a couple of Bash commands. But it's not me doing it, it's a hired hand. What I'd like is a Live CD that once booted, just gives you the option of erase the HD(s) on the machine.

Does such a disk exist? There must be loads of people who have to do stuff like this.