Canon EOS rebel xs - Manual (Page 111)

111
Handy Features
[Auto reset]: Resets the file numbering to 0001 whenever the
card is replaced.
Each time you replace the card, the file numbering restarts from
0001. This is convenient if you want to organize images according to
cards.
However, if the replacement 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 restart the
file numbering from 0001, you should use a newly-formatted card.
[Manual reset]: You can reset the file numbering to 0001 at any
time or for 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 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.
0051
Card -1
0001
Card -2
File numbering after replacing the 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 card still has storage capacity. The LCD monitor will
display a message to replace the card. Replace with a new card.
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.