Darik's Boot & Nuke is popular, or you can boot from any Linux live CD and run the command "dd if=/dev/zero of=/dev/something" where "something" is the disk you want to erase.
Ignore anyone who says you need super-secure multiple passes with random data - it's very time-consuming, and a single-pass zero fill (provided it completes) will put your data beyond any hope of recovery.
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