How to unmount disk w/ OS X 10.7 Lion

I have a used 2007 Mac Pro 2,1 Tower. It came w/ Lion 10.7 already installed, licensed to the previous owner (or maybe even someone else! bc he does not know the password for the Mac, which is where my trouble began - couldn't make any changes to the comp). I ordered 10.6 Snow Leopard from Apple that I may begin a fresh install and get my own AppleID for upgrades, purchses from app store, etc.
Here's my problem:
I tried to erase using "zero out data" and received this message: "Secure Disk Erase failed - Secure Disk Erase failed with the error: Couldn't unmount disk".
I have read that the reason you cannot unmount disk is because you booted on the RecoveryHD where the OS X is installed. Any one have a work-around for this? I need to erase the entire HD to start over. No back-ups needed as I haven't done anything on the comp. Thanks.

You need to boot the system from the Mac OS X 10.6 installer disk and run Disk Utility from the menu there. Then you can repartition and erase the disk.
Regards.

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