boot and nuke

I‘m going to upgrade my FreeBSD 7.x server hard disks and going to send back the original 73GB hard disk to my vendor. I wanted to make sure that no one should able to use my personal data from old hard disk, especially files stored in /home/you/projects directory. I know how to use sDelete under MS-Windows to delete a file permanently. How do I permanently erase files under FreeBSD operating systems?

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I am going to sell my laptop soon. Before discarding my system, I want to make sure that no one should able to use my personal data using any method (format do not work). Is there any open source software out there that can help me permanently erase my hard disk?

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