- when done correctly • OE measurement needs to be double the strength of the tapes • Older equipment was NSA approved, but are unlikely to have the strength to destroy modern tape • They need regular servicing • Degaussers output a lot of heat, causing them to cut-out and require a cool-off period. • Heat in BaFe chemical structure causes stronger coercivity • It’s impossible to know what force has hit the tape and whether it has been erased completely • There is no way of measuring or testing the accuracy of the process • Recommend that each tape is tested afterwards • It doesn’t impact or erase the memory chip of modern tapes – Microwave frequency needed • Anyone can use a plug