I have booted in Tech Tool; now how can I erase the Mac Hard Drive?

I bootrd my MacBook Pro in Tech Tool, and want to erase the Hard drive completely. I can't do it. Any suggestions?

A Late 2008 MacBook Pro should be able to boot off a disc that looks like
And says Mac OS X 10.6 to erase the hard drive.  But before we even go that far, why do you want to erase, and is your data backed up?

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