Mac Security Tip: Securely Erase Free Space and Hard Disks
In our last Mac Security Tip, Securely Erase Trash, we explained that you can securely overwrite files, but pointed out that this may not be as secure as it seems. When a computer writes a file to a hard disk the first time – when you first save a new file – it is stored [...]
http://blog.intego.com/2011/04/15/mac-security-tip-securely-erase-free-space-and-hard-disks/