Originally posted by Viking62 No, i tried many different cards . 1. Car formatted2. Camera taking pictures3. Transfer to MAC 4. SD back to camera 4. Message "Card is not formatted" 4. Format again SD card in camera or on MAC 5. It works but all pictures are erased ??
Formatting the card will always erase all the images.
i imagine your problem is the way your Mac is handling the card after file transfer.
Do you "eject" the card from your Mac before you remove it physically ?
Does the Mac add or remove any files from the card ?