No, you can't.
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The dsi sd card is about a inch long, about a 6th of a inch wide.. the sd card made specially for the dsi (the one I have) is white and says Nintendo dsi on it
The Nintendo DSi cannot save pictures without an SD card. SD card must also be compatible with the Nintendo DSi to be able to save photos.
Yes you can as long as you have a SD card installed in your DSi. Copy pictures from system to SD card. Install SD in PC card reader and download.
The DSi can't execute code on the SD card, all it can do is store pictures on it, or play music. There's no way to play a homebrew game off the SD card, the DSi simply wasn't made with the means to do so.
It doesn't need a SD card, but you can put in a SD card if you want to store more pictures and music. If the SD card doesn't hold music, but camera, the SD card will not work on the music.