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Supremacy Song

Card Reader

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The technology for card readers and writers basically still works the same as cassette tapes. The iron-heavy stripe is magnetized by a writing head, and the stripe is read by sliding over a sensitive metal head that picks up the tiny differences in magnetic charge.



Back in the bad old days, it was a layer of tape exactly the same as was used in cassette tapes.  I remember cards where the strip came off, looking exactly like a cassette's tape.


Newer cards have a stripe of iron-heavy material embedded in them as the plastic cards are created, but it is still a magnetic stripe. While I don't know the exact lab process, I imagine it is effectively the same thing, running a line of iron-heavy material over a part of the card as it is put together in layers.

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