"Card Locked" Message on Casio Digital Camera

You learn something new every day!

Shelly is correct, most memory cards do have a slider switch to lock or unlock writing ability to the memory card. See attached image for the location of this slider on a SanDisk memory card

Most newer memory cards have a little tab on them like the old disks for computers, and by sliding over you can " lock " the card, inspect the card look for a tab, or little button, and see if you can unlock it.

Does it have a memory card?