Canon EOS-1D X Mark III Advanced User's Manual page 737

Note
Rec. separately/Rec. to multiple
Images are recorded with the same file number to card
and .
The number of shots available shown in the viewfinder and
top LCD panel is the quantity on the card with less available
space.
[Card* full] is displayed when one of the cards becomes full,
and shooting is no longer possible. To continue shooting,
either replace the card or set [
and select the card with free space.
See Folder Settings
+card/folder sel.].
Rec options
• Standard
Records movies to the card selected in [
• Auto switch card
Same as [Standard], but shooting ends when the card becomes
full. When you resume shooting, the camera switches to the other
card. At this time, a new folder is created.
• ,
For each recording, a RAW movie is recorded to card
MP4 movie to card
card becomes full, recording is no longer possible.
RAW movies are recorded at [5472×2886] and MP4 at [4096×2160
].
Rec options] to [Standard]
for details on [Folder] in [ : Record func
, both with the same file number. When one
737
Record/play].
and an