Correction for the amount of a Magnetic Stripe Card
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How much is 23.40 bytes?
It's about one-fifth as much as a Magnetic Stripe Card
The amount of a Magnetic Stripe Card is about 100 bytes.
(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 100 bytes. According to legend, Forrest Parry, the IBM engineer who developed the first magnetic stripe card in 1960, was able to solve the problem of adhering the strip to the card after his wife suggested using an iron.