Format memory cards. To begin formatting, choose a memory card slot and select []. Note that formatting permanently deletes all pictures and other data on the card. Before formatting, be sure to make backup copies as required.
Caution: During Formatting
Do not turn the camera off or remove memory cards until the message [] clears from the display.
Keeping both format (O/Q and S/Q) buttons pressed for over two seconds displays a dialog prompting you to select a card for formatting.