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dd, that is not filesystem corruption, that is a physically damaged/defective/defunct card.dd. My last comment applies if you are literally getting I/O errors reported while runningdd, because the nature of the data involved is completely meaningless to it. You can take a card filled with destroyed data andddas much of it off as you want, and likewise take random junk andddit to a card, and there should be no errors reported. If there are, it means somewhere along the line there are hardware problems (or possibly software bugs, but hardware failure is more likely in this case).