[oclug] How do I nuke the contents of my hard drive?

[Johnathan Hicks]

I'm going to be sending my Linux hard drive back to Fujitsu for RMA tomorrow 
morning (Friday), and thought that it might be wise to erase the contents of 
the drive before I do. This is still possible because the drive hasn't had a 
catastrophic failure yet. In fact, the drive apparantly stopped misbehaving 
just after I recieved my RMA #. ;-)
Are there any recommendations on how to nuke the contents and what to use to 
do it?
Thanks.

--John