how to wipe hard drive

Hello, how bad is it?

How to format your disks...

http://www.kenstone.net/fcp_homepage/partitioning_tiger.html

(To Install OSX on an IntelMac the Drive it needs the GUID Partitioning scheme mentioned at the bottom.)

Thanks to Pondini, Formatting, Partitioning, Verifying, and Repairing Disks...

http://Pondini.org/OSX/DU.html

If that doesn'twork you need to physically destroy it.