You can't run or store apps on the card. All applications must reside in the BB's internal memory. The card is for storing music, ringtones, pictures, and movies. Open the camera, then hit the Menu button, choose Options, and make sure "Store Pictures" is set to On Media Card. When downloading ringtones or pictures, you'll be prompted to choose where to save them. That's when you choose the media card. Do it once and it should be the default choice for next time.
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