What s the purpose of that black stripe that runs across the back of my credit cards?
Virtually all credits cards now have a black magnetic stripe on their back that has a variety of information coded into it. Although your credit cards probably only have one stripe, there are probably two “information tracks” on it. The first track includes information such as your name, the card s expiration date, your credit limit and your personal identification number. The second track is the one with your individual account number, the date you opened the account, and other discretionary data.
