Auto Reset; Manual Reset - Canon EOC-1DX Instruction Manual

Auto Reset

The file numbering restarts from 0001 each time the card is
replaced or a new folder is created.
When you replace the card, create a folder, or switch the target card
(such as f → g), the file numbering restarts from 0001 for the new
images saved. This is convenient if you want to organize images
according to cards or folders.
However, if the replacement card or existing folder already contains
images recorded previously, the file numbering of the new images may
continue from the file numbering of the existing images in the card or
folder. If you want to save images with the file numbering starting from
0001, use a newly formatted card each time.
File numbering after
replacing the card
Card-A (f)
0051
File numbering is reset

Manual Reset

To reset the file numbering to 0001 or to start from file number
0001 in a new folder.
When you reset the file numbering manually, a new folder is created
automatically and the file numbering of images saved to that folder
starts from 0001.
This is convenient if you want to use different folders for the images
taken yesterday and the ones taken today, for example. After the
manual reset, the file numbering returns to continuous or auto reset.
(There will be no Manual reset confirmation screen.)
If the file number reaches 9999 in folder 999, shooting will not be possible even
if the card still has storage capacity. A message explaining the need to replace
the card will appear on the LCD monitor. Replace the card with a new one.
Card-B (g)
0001
3 File Numbering Methods
File numbering after
creating a folder
Card-A
100 101
0051 0001
159