Canon 40D - Manual (Page 73)

73
3 File Numbering Methods
Resets the file numbering to 0001 whenever the CF card is replaced
Each time the CF card is replaced, the file numbering starts from 0001.
This is convenient if you want to organize images according to CF cards.
If the replacement CF card contains images recorded previously, the file
numbering of the new images might continue from the file numbering of
the existing images in the card. To start the file numbering from 0001, the
CF card must be formatted before use.
The file numbering starts from 0001 in the 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 when 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.
Auto Reset
Manual Reset
XXX-0051
CF card -1
100-0001
CF card -2
File numbering after replacing the CF card
File numbering is reset
If folder No. 999 is created, [Folder number full] will appear on the LCD
monitor. If that folder contains images reaching file number 9999, shooting
will not be possible even if the CF card still has storage capacity. The LCD
monitor will display a message to replace the CF card. Be sure to replace
the CF card.
For both JPEG and RAW/sRAW images, the file name will start with “IMG_”.
The extension will be “.JPG” for JPEG images and “.CR2” for RAW and
sRAW images.