The original DS/lite does not use an SD card. You need either a DSi, XL or 3DS, and these use regular SD cards that can be purchased from supermarkets, computer or camera stores.
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I have just been lookin on the Nintendo website and you can play your DSiware games straight from the SD Card + you can copy DSiware game save files to your SD card. You can't however transfer your DS games to an SD card or transfer your DS game save files to your SD.
You don't. The DS Lite doesn't have an SD slot; only the DSi does (including DSi XL.)
The original DS and DS Lite cannot take a memory card at all. The DSi takes SD memory cards.
Yes but you need a third party cartridge such as the R4.
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.