Canon 1D X - Manual (Page 115)

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3 Selecting the Card for Recording and Playback
Standard
Images will be recorded to the card selected with [Record/play].
Auto switch card
Same as with the [Standard] setting, but if the card becomes full,
the camera will automatically switch to the other card to record
images. When the camera switches to the other card, a new folder
will be created automatically.
Rec. separately
You can set the image size for each card (p.117). Each image is
recorded to both Card f and Card g at the image-recording
quality you have set. You can freely set the image size to 3 and 1
or 5 and 61, etc.
Rec. to multiple
Each image is recorded to both Card f and Card g at the same
image-recording quality you have set. You can also select
RAW+JPEG.
When [Rec. separately] is set, the maximum burst will decrease (p.120).
When [Rec. separately] or [Rec. to multiple] is set, the image will be
recorded under the same file number to both Card f and Card g. Also,
the top LCD panel will display the number of possible shots of the card
having the lower number. If one of the cards becomes full, [Card* full] will
be displayed and shooting will be disabled. If this happens, either replace
the card or set the recording method to [Standard] or [Auto switch card]
and select the card with remaining space to continue shooting.
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