Canon EOS Rebel T5i 18-55mm IS STM Lens Kit Instruction Manual - Page 49

3 Formatting the Card Execute [Format card] in the following cases: The card is new. The card was formatted by a different camera or a computer. The card is full with images or data. A card-related error is displayed (p.337). About Low-level Formatting Perform low-level formatting if the card's recording or reading speed seems slow or if you want to totally erase all data in the card. Since low-level formatting will format all recordable sectors in the card, the formatting will take slightly longer than normal formatting. You can stop the low-level formatting by selecting [Cancel]. Even in this case, normal formatting will be completed and you can use the card as usual. When the card is formatted or data is erased, only the file management information is changed. The actual data is not completely erased. Be aware of this when selling or discarding the card. When discarding the card, execute low-level formatting or destroy the card physically to prevent the personal data from being leaked. Before using a new Eye-Fi card, the software in the card must be installed in your computer. Then format the card with the camera. The card capacity displayed on the card format screen may be smaller than the capacity indicated on the card. This device incorporates exFAT technology licensed from Microsoft. 49