Canon EOS 600D - Manual (Page 170)

Handy Features
170
The image files will be numbered from 0001 to 9999 in the order the
images are taken, then saved in a folder. You can change how the file
number is assigned.
The file number will appear on your computer in this format:
IMG_0001.JPG.
Under the [5] tab, select [File
numbering], then press <
0>. The
available settings are described below.
Select one, then press <
0>.
[Continuous]: The file numbering continues in sequence even
after you replace the card or create a folder.
Even after you replace the card or create a new folder, the file
numbering continues in sequence up to 9999. This is convenient
when you want to save images numbered anywhere between 0001
to 9999 in multiple cards or folders into one folder in your personal
computer.
If the replacement card or existing folder already contains images
recorded previously, the file numbering of the new images might
continue from the file numbering of the existing images in the card or
folder. If you want to use continuous file numbering, you should use
a newly-formatted card each time.
3 File Numbering Methods
XXX-0051
Card-1
XXX-0052
Card-2
File numbering after
replacing the card
Next sequential file number
100
XXX-0051
101
XXX-0052
Card-1
File numbering after
creating a folder