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235 zettabytes is about 3,000,000,000,000,000,000,000 times as much as a Magnetic Stripe Card.
In other words, it's 3,000,000,000,000,000,000,000.000000000000000000000000 times the amount of a Magnetic Stripe Card, and the amount of a Magnetic Stripe Card is 0.000000000000000000000300 times that amount.
(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 0.0000000000000000001000 zettabytes. 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.
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