Canon A20 - Manual (Page 60)

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Please note that even protected images are
erased when a CF card is reformatted.
To cancel protection...
Select the image you wish to unprotect, and
then repeat Steps 2 and 3 as necessary.
Use the protect feature to protect important
images from accidental erasure.
1
Turn the mode dial to .
2
Press the MENU button to
display the menu.
3
Press or button to
select , and then press the
SET button.
4
Press or button to
select an image you wish to
protect, and then press the
SET button to protect it.
Protected images are identified by the
Protected Icon.
5
Press the MENU button to
close this feature.
Protecting Images
Protected Icon