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D70s doesn't use SD card. Either you meant CF, or you've miscategorized your question. Do you ever remove the card from the reader? If not, it may have been 'ejected'?not physically, but electronically by turning off the reader. Usually you can reseat the card, and the reader will re-detect it. If the reader simply doesn't acknowledge the card no matter what you do, check for any bent pins in the reader or broken contacts on the card.