[ale] erasing a hard drive

[lists at serioustechnology.com (Geoffrey Myers)]

I've drawn a blank.  What is the name of that free software that I can 
use to erase a hard drive?  It will run multiple overwrites?

I've got a number of old drives I need to dispose of and I don't want to 
bother trying to figure out what's on them.

-- 
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson