gap, and the flux magnetizes the oxide on the media. When the data is read by the drive, theread headpulls a varying magnetic field across the gap, creating a varying magnetic field in the core and therefore a signal in the coil. This signal is then sent to the computer asbinary ...
To deactivate anti-theft strips, you need to magnetize the strip along its length. There are ways to do this; bringing it into close contact with anything magnetic could erase the information encoded on the magnetic strip or place a strong enough magnetic field along the length of the strip....