In the factory settings, the camera is set to overwrite the oldest pictures when the SD card is full. In the camera menu, however, you can also set the camera not to take any more pictures when the SD card is full.
Is the SD endless memory at ONE the camera deletes the oldest image and saves the most recent on the card when the SD card memory is full.
With the selection OFF no more images are saved when the memory is full.
Generally, when you hang a camera in a new location, we recommend that you use an empty or a freshly formatted SD card. You can format the SD card via the menu in the camera.
If there are problems with formatting, please check whether the mechanical write protection of the SD card (switch on the side of the card) is switched off.