Memory cards must be formatted before first use or after being formatted in other devices. Format the card as described below.
Formatting Memory Cards
Formatting memory cards permanently deletes any data they may contain. Be sure to copy any photographs and other data you wish to keep to a computer before proceeding (0 Copying Pictures to the Computer).
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Highlight Yes.
To exit without formatting the memory card, highlight No and press J.
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Press J.
A message will be displayed while the card is formatted. Do not remove the memory card or remove or disconnect the power source until formatting is complete.