Nikon D300S User Manual page 243

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Choosing a Memory Card
If two memory cards are inserted, you can select
a memory card for playback by pressing the W
button when 72 thumbnails are displayed. The
dialog shown at right will be displayed;
highlight the desired memory card slot and
press 2 to display a list of folders, then highlight
a folder and press J to view the pictures in the
selected folder.
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See Also
For information on choosing the role played by the center of the multi
selector, see Custom Setting f2 (Multi selector center button, 0 291).
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