Canon EOS 20D - Manual (Page 61)

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The file number is like the frame number on film. There are two file
numbering methods: [Continuous] and [Auto reset]. The images you
take are automatically assigned a file number from 0001 to 9999 and
saved in a folder (created automatically) that can hold up to 100
images.
1 Select [File numbering].
¡ Turn the <
5> dial to select [c File
numbering], then press <
0>.
2 Select the file numbering method.
¡ Turn the <
5> dial to select
[Continuous] or [Auto reset], then
press <
0>.
The file numbering continues in sequence
even after you replace the CF card. This
prevents images from having the same file
number, so image management with a
personal computer is easier.
Each time you replace the CF card, the file
numbering will be reset to the first file
number (XXX-0001). Since the file number
starts from 0001 in each CF card, you can
organize images according to CF card.
3
File Numbering Methods
Continuous
Auto reset
XXX-0051
CF card -1
XXX-0052
CF card -2
File numbering after
changing the CF card
Next sequential file number
XXX-0051
CF card -1
XXX-0001
CF card -2
File numbering after
changing the CF card
File number is reset
If folder No. 999 is created, [Folder number full] will appear on the LCD
monitor. Then if file No. 9999 is created, “Err CF” will be displayed on the
LCD panel and in the viewfinder. Replace the CF card with a new one.
For both JPEG and RAW images, the file name will start with “IMG_”. The file
name extension will be “.JPG” for JPEG images and “.CR2” for RAW images.