Hi all, First off, I realise this topic has been discussed a lot so I apologise if this new thread is a repeat of another - I searched for the question I want to ask but couldn't find anything. Basically, I'm confused about the zeroing out data process. I need to be certain that it's impossible to tell if internet pages of a particular nature have been viewed on this macbook. I was feeling paranoid so I ran a 7 pass overwrite. However my CD drive doesn't work so I was unable to do anything with the grey setup CDs. Nothing seems to be particularly different following the overwrite - the files on my desktop had been deleted but that was all I could notice (I am a beginner mac user though). So now I'm not sure where I'm at. Would the 7 pass have overwritten all the sensitive info I wish to make unrecoverable, even without using the setup CDs? Thanks for any help.