Formatting - Canon EOS-1 DX Mark III Advanced User's Manual

Card Formatting
If the card is new or was previously formatted (initialized) by another camera or computer,
format the card with this camera.
Caution
When the card is formatted, all images and data on 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 and data to a computer, etc.
before formatting the card.
1.
Select [ : Format card].
2.
Select a card.
[ ] represents card 1, and [ ], card 2.
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