Canon EOS REBEL T2I Instruction Manual page 66

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 newly4ormatted card.
File numbering after replacing the card
File numbering is reset
_ [Manual reset]: To reset the fire numbering to 0001 manually or
to start from fiJe 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 if 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.
if the file number in foider No. 999 reaches 9999, Shooting wiii notbe
possible even if the card sti!! has storage capacity. The LCD monitor will
disP aY a message telling you to replace the card, Rep!ace it with a new card.
FOEboth jPEG and RAW image s, the file name will Start with ,IMGL;': Movie
file names will start with ,MVL". The extension will be ":JPG '_for JPEG
images, ".CR2'! for RAW images, and ": MOV!! for movies.
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