The most common causes of Memory Card Failure are listed below:
Removing the memory card from a camera while an image is being written to the card
Removing the card from a memory card reader while files are still being transferred to a computer
Removing the card from a card reader while folders and files from the card are open on a computer
Opening, deleting, renaming or moving files on the card while its contents are open on a computer
Using a memory card which has not been formatted in the camera. Use the delete/erase function when needed, however a card should be regularly formatted.
Formatting a card in a computer instead of the camera
Inserting a second memory card into a card reader before closing and removing the first when viewing images on the card from a computer
Taking photos when camera batteries are nearly empty
Taking photos too rapidly so the camera can not complete writing one image before starting the next
Continually shooting and deleting, shooting and deleting images when the card is full
Letting a memory card get too full before downloading the images to a computer or storage device. Cards that are too full may overwrite the card headers.
Using a memory card from one camera in a different camera without formatting it in the new camera first
