Why would I use high coercivity?
A. The advantage of high coercivity is that it is harder to encode information on the stripe. This also means that the it is more difficult to erase the information and so problems of accidental erasure are diminished. It is still possible to erase the information, but common household magnets are not usually powerful enough. This means the person who puts the transit card on the refrigerator will not usually damage the encoding on the stripe. The disadvantage is that although the encoding can be read in a standard low coercivity reader the encoder must be designed to encode high coercivity stripes.
