What data is stored on credit card magnetic strip?
Sophia Koch
Updated on February 10, 2026
These tracks contain the credit card account number, name, expiration date, service code, and card verification code. Credit cards primarily or exclusively use the first two tracks. The third track sometimes contains additional information such as a country code or currency code.
How does a magnetic stripe credit card work?
Magnetic Stripe Cards This standard tape strip contains three magnetic tracks that are used to store the card’s code data. The card is usually presented to the reader by swiping or inserting it into the reader, which obtains the card’s code using a magnetic head that detects the magnetic field generated by its strip.
How much data can a magnetic strip hold?
Like the hard disk and the transistor, magnetic tape has advanced enormously over the decades. The first commercial digital-tape storage system, IBM’s Model 726, could store about 1.1 megabytes on one reel of tape. Today, a modern tape cartridge can hold 15 terabytes.
Does a credit card have a magnetic strip?
The stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a very tiny bar magnet about 20 millionths of an inch long.
Is PIN stored on magnetic strip?
With chip and PIN cards, the credit card data is stored on a tiny computer chip — not a magnetic stripe — and customers punch in a four-digit PIN (personal identification number) instead of signing the screen.
How does the magnetic stripe on the back of a credit card work?
The stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a very tiny bar magnet about 20 millionths of an inch long.
How much information is stored on a magnetic stripe?
The coating of the magnetic stripe on the back of such cards can hold about 200 bytes of information. Customer account numbers can be recorded on the magnetic stripe so that it can be read by bank ATMs, credit card authorization terminals, and many other types of magnetic stripe readers. 2.5k views.
How is data stored on a magnetic card?
According to existing standards, a magnetic card stores information in three separate tracks. All three tracks possess different bit densities and encoded character sets. The average bit density of the first track is 210 bits per inch (bpi).
What is the recording density of a magnetic stripe card?
Tracks one and three are typically recorded at 210 bits per inch (8.27 bits per mm), while track two typically has a recording density of 75 bits per inch (2.95 bits per mm). Each track can either contain 7-bit alphanumeric characters, or 5-bit numeric characters. Track 1 standards were created by the airlines industry (IATA).