How to make the magnetic stripe of credit card unable to read data? How to test whether it is successful?
This is very simple. You can take a magnet (preferably a strong magnet) and put the card on the magnet for a period of time (such as one night) to degauss.
The test method is also very simple: insert the card into the 24-hour self-service terminal to see if it can be read. The reading is not degaussed, and the display is not valid for hairpin or unreadable things.