| Magnetic stripes are defined by coercivity, or how densely the magnetic particles are packed into the stripe. |
| Modern data tapes are of such a high coercivity, that accidental erasure by a magnetic field does not constitute a major risk. |
| Mid-range products such as DLTtape IV, Super DLTtape and LTO Ultrium data cartridges have a very high coercivity, in excess of 1800 oersted. |
| The higher the coercivity, which is measured in Oersteds, the harder the data is to erase. |
| The straightforward remedy is to adopt magnetic materials of higher coercivity, meaning they are harder both to magnetize and to demagnetize. |
| The coercivity of haematite exceeds that of magnetite, and hence this technique is of little use on haematite-dominated magnetizations. |
