Hello, I've got two quick questions: -Can I used disk utility to securely wipe the drive that OS X is installed on (the drive only has one partition... the partition OS X is on)? -I assume that the answer to the first question is 'no'. Can anyone recommend a good program to securely wipe the hard drive of a macbook? By 'good' I mean free and simple. Thanks much I'm sorry, I've managed to solve my own problem. Apologies.