If the card is new or was previously formatted by another camera or computer, format the card with the camera.
The procedures for initializing a memory card with the camera are explained here.
CAUTION
When the card is formatted, all images and data in the card will be erased. Even protected images will be erased, so make sure there is nothing you need to keep. If necessary, transfer the images to a personal computer, etc., before formatting the card.
Formatting the Card
1. Set the power switch to ON.
2. Press the MENU button to bring up the menu.
3. Press the button, and then select the [ ] tab.
4. Turn the Quick Control Dial to select [Format card] then press SET.
5. Select the card that you want to format.
[ ] is Card 1, [ ] is Card 2.
Turn the Quick Control Dial to select the card, then press SET.
6. Select [OK], then press SET.
The card will be formatted.
When the formatting is completed, the menu will reappear.
IMPORTANT
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 data from being leaked.
REFERENCE
The card capacity displayed on the card format screen might be smaller than the capacity indicated on the card.
button, and then select the [
] tab. 
] is Card 1, [
] is Card 2. 
