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If it is saving only internally and it just started doing it there are only a few options that can be responsible for this. All are related to the SD card in the camera. First, make sure the SD card is not write protected. There is a write protect switch on the side of the ST card which if in the wrong position will make the card read only. also, make sure the SD card is formatted. If it is formatted, I would suggest formatting it in the camera to make certain that the camera recognizes the format. The only other possible cause of this problem would be if the SD card is full or if it is damaged and cannot be used. In this case of course I would suggest trying replacing BSD card with a new one. But I would try the other steps first because it is fairly uncommon for an SD card to fail.
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