Explanation: If there are several folders on your memory card you can choose here from which folders images will be displayed in playback mode:
- only from the one that is currently used for new pictures (as defined in the shooting menu Storage folder)
- from all folders the D7000 has created (default)
- from all folders on the memory card – possibly including pictures from other sources.
Tips: Ignore. I would not exchange memory cards between cameras without formatting them to reduce the risk of write errors (=loss of pictures!).
That makes the last option unattractive and I do not see a practical use in using several Storage folders and consequently the other two choices.