#10. "RE: New D90 owner and do you reformat your memory card routinely?" In response to In response to 0
Good question! I was told by a couple of photographers in a camera club I'm in that you should reformat your card IN the camera using the camera's function to reformat the card. This gives the card the exact format settings that the camera likes to use.
Reformatting clears any photos and extraneous data left on the camera. Supposed to lead to less card corruption, too.