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How do memory cards work?

Question

How do memory cards work? How does something that is so small and doesn’t move store so much?
Nigel, Wandsworth

Answer

** Definitive **
Name: Paul, Chiswick
Qualification: Tech-xpert
Answer: Memory cards contain millions of slivers of silicon, which are mapped out into what are effectively capacitors. Each one contains binary digital code, which is read by the device in question, translated into an image, music or whatever it’s storing.

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