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But SD cards are just one form of flash memory. They have different controllers but I believe the semiconductor construction is the same. Whatever else you are using is just as likely (or unlikely) to be corrupted by metal detectors in the powered-off state, isn't it?
I have read there is huge variance in the resulting quality of flash memory. Some cells go bad after only a few thousand write/read cycles. It depends on the fabrication processes used (some manufactures are better than others). Recent research is pointing toward extending flash lifespan by adding a microscopic heater circuit. Exciting times!
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