Canon EOS 5D - Manual (Page 71)

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3 File Numbering Methods
Each time you replace the CF card, the file numbering will be reset to
the first file number (0001). Since the file number starts from 0001 in
each CF card, you can organize images according to CF card. Note that
if the replacement CF card already contains images, the file numbering
will start after the highest file number in that CF card.
This creates a new folder automatically and resets the file number to
0001. Images captured thereafter are saved in this new folder. The file
numbering method (Auto reset or Continuous) that was in effect before
the manual reset will continue to take effect.
Auto Reset
Manual Reset
XXX-0051
CF card -1
XXX-0001
CF card -2
File numbering after
changing the CF card
File number is reset
If file No. 9999 is created, “FuLL” will be displayed on the LCD panel and in
the viewfinder. Replace the CF card with a new one.
For both JPEG and RAW images, the file name will start with “IMG_”. The
extension will be “.JPG” for JPEG images and “.CR2” for RAW images.