Some people believe that data security is possible via disk destruction and many people have told me a story about erasing hard drives with magnets.

The myth goes that you can enter a code into your mobile phone and this turn the phone into a Radar Detector in order to allow you to detect a police radar. This is simply not true on a number of levels.

People often assume that their safe will protect data on their tapes (say a backup of their server). This is not so much a myth but an assumption many people make without any basis.