Well, let me go back a bit:
As to file numbering I have always used the default of continuous. That has always had the effect of continuing on from the next number past the highest value in the card. I have always used duplication of images across cards, so there has never been an issues. To my knowledge the file management system does not have the ability to overwrite files.
So, looking at the various options in the menu:
If one card is using still images and one video, they will be reading and writing files with different extensions so there should be no conflict if the cards are switched.
If one card stored RAW and the other JPG files, the same thing should apply as both the extensions are different, and the numbers are continuous so no overwrite should happen.
The other file numbering option, to restart numbering on a different card should not be an issue if the camera has taken images already. I think this is much the same functionality as if one was switching cards between cameras.
So, others may have more input but that is my experience and understanding.
I hope that helps!
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
