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If it's actually saying "write protect" then look at your memory card. SD and SDHC cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.
To understand the photo loss situation, consider a scenario: You format a memory card in Digital Camera, and start to capture some pictures. However, while capturing pictures, your camera shuts down due to low battery. Now, after recharging battery, when you try to access those photograph on the card, you receive the following error message on camera screen:
The Card requires formatting: Additionally, the camera is unable to capture any new photographs.
The main cause for the above error message is corruption of memory card due to conking of battery while a read/write operation was running.
These memory card needs to be formatted before you save any new pictures. It is always a good practice to take backup of card and format it before use. This enables you to fight with any damage done to the memory card and to erase the old data saved on the card. However, the probability of card getting corrupted again (after you have saved new data) still exists.
First try formating with an external SD Card reader connected at PC and test it.
Sounds like a memory problem. You can try using the built-in menu utility function of formatting the memory (be it internal or external memory). Of course this will also delete all current files/photos in it.
Hope this be of some help/idea. Post back how things turn up or should you need further information.
Good luck and kind regards.