Need help wiping dual harddrives on laptop

I am tryingto completely wipe the 2 harddrives on my laptop and install ubuntu. I already tried using the ubuntu disk to wipe and install. After Ubuntu loaded up lo and behold there were still old files on my computer. I want EVERYTHING gone from these hard drives and just Ubuntu on there... any suggestions?
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More about need wiping dual harddrives laptop
  1. You need a secure erase program (a program that writes over the top of the hard drive) it takes longer but it does completely erase your hard drive

    Follow this link for a free utility that does what you want:
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