The Degausser DG.02 (Hardware eraser) is used to erase non-operational storage units, as well as removable magnetic media such as tapes and ZIP drives. The degausser erases media by applying a strong magnetic field. This destroys all information recorded on the unit, including calibration and servo information.
To produce a magnetic field, the degausser use an electromagnet, which produces a magnetic field by passing current through a coil. To provide the large current necessary the degausser is equipped with a bank of sealed lead-acid batteries. The benefits of using DC-current like DG.02 though the coil instead of using AC-current are:
