Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 152)

152
If either a CF card or CFast card is inserted in the camera, you can
start recording captured images. When only one card is inserted,
you do not have to follow the procedures described on pages 152-
154.
If you insert both cards, you can select the recording method and select
which card to use for recording and playing back images.
[
f ] indicates the CF card, and [ g ] the CFast card.
1
Select [Record func+card/folder
sel.].
Under the [ 5 1 ] tab, select [ Record
func+card/folder sel. ], then press
< 0 >.
2
Select [Record func.].
3
Select the recording method.
Select the recording method, then
press <
0 >.
3
Selecting the Card for Recording and Playback
Recording Method with Two Cards Inserted