Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 74)

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If the card is new or was previously formatted by another camera or
computer, format the card with this camera.
1
Select [Format card].
Under the [ 5 1 ] tab, select [ Format
card ], then press < 0 >.
2
Select the card.
[ f ] is the CF card, and [ g ] is the
CFast card.
Select the card, then press < 0 >.
3
Format the card.
Select [ OK ], then press < 0 >.
X The card will be formatted.
Before You Start
3 Formatting the Card
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.