Track 1 data
The top track on a payment card's magnetic stripe, and the only one with room for the cardholder's name.
The track was defined by IATA, the airline industry body, which wanted ticket desks to read a passenger's name straight off the card. It's recorded at 210 bits per inch and holds up to 79 alphanumeric characters, against Track 2's 40 digits. The format is in ISO/IEC 7813. After the start sentinel and format code B come the card number, a separator, the name as SURNAME/FIRSTNAME, another separator, the expiry date, the service code and the issuer's discretionary data.
Most payment systems care more about Track 2, which is shorter and easier to parse. Forgers still want Track 1, because a card whose embossed name doesn't match the stripe raises eyebrows at the till. Track 3, intended for the savings-and-loan industry, is almost never used.