Canon EOS REBEL T2I Instruction Manual page 65

Handy Features
File Numbering Methods
The file number is like the frame number on a roll of film. The captured
images are assigned a sequential file number from 0001 to 9999 and
saved in one folder. You can change how the file number is assigned.
The file number will appear on a computer in this format:
IMG O001.JPG
Under the [_t'] tab, select [FHe
numbering], then press <_>. The
available settings are described below.
Select one, then press <_>.
®_ [Continuous]: The file numbering continues in sequence even
after the card is repJacedo
Even after you replace the card, the file numbering continues in
sequence up to 9999. This is convenient when you want to save the
images numbered anywhere between 0001 to 9999 from multiple
cards into one folder in your computer.
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. If you want to use continuous file
numbering, you should use a newly4ormatted card each time.
Fi_e numbering after replacing the card
Next sequential file number
140