Memory card might gone bad but can do this following troubleshooting step.
Formatting a memory
** This is used for formatting the memory. If you run [Format] on the memory, all
images, including the protected images, will be deleted. Be sure to download
important images to your PC before formatting the memory.
[No] : The memory will not be formatted. Press
the menu button three times and the menu
display will disappear.
[Yes] : A [Processing!] message appears and the
memory will be formatted. If you run
FORMAT in Play mode, a [No Image!]
message will appear.
Be sure to run [Format] on the following types of memory card.
- A new memory card, or an unformatted memory card
- A memory card that has a file this camera can't recognize or one that has been
taken from another camera.
- Always format the memory card using this camera. If you insert a memory card
that has been formatted using other cameras, memory card readers, or PCs,
you will get a [Card Error!] message.
** There might be bad sectors on your memory card.