Canon eos rebel t1i - Manual (Page 133)

133
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.
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]: To reset the file numbering to 0001 manually 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 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.
Card-1 Card-2
0051 0001
File numbering after replacing the card
File numbering is reset
If the file number in folder No. 999 reaches 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_”. Movie
file names will start with “MVI_”. The extension will be “.JPG” for JPEG
images, “.CR2” for RAW images, and “.MOV” for movies.