Memory cards are sensitive and can be easily damaged, so please use the following general handling precautions to ensure the best possible results with your images;
Precautions while operating the camera
If the camera's power light is on or flashing, the camera is saving, loading, or erasing the data on the memory card.
To avoid damaging content stored on the card during this process, please never
Precautions for formatting and editing a memory card
Memory cards previously formatted on computers or on other camera manufacturer’s digital cameras may not operate correctly with Canon cameras.
Caution
Formatting a memory card will erase everything previously contained on the card. So, prior to formatting a memory card, please ensure that any previously stored images that you wish to keep have already been transferred to your computer or another suitable device.
Please refer to your product Instruction Manual for detailed instructions on how to successfully format a memory card.