DCIM/

All files/folders created on SD/SDHC from the DSi.

Note that this directory layout is standard; see Wikipedia's page on DCIM

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• ???NIN02/ : Contains photos copied to the SD taken from the camera.
• ???NIN01/ : Contains screenshots from Wii games, and possibly in the future DSi games (the latter is just speculation).

??? represent a number (called N here) which begins with 100 and is incremented with 1 each 100 photos copied to the SD, each directory formed on this format contains the (N-100)*100+1 to (N-99)*100 photos named from HNI_0001.JPG to HNI_0100.JPG