I've seen that with some SD CARDS. But details are too sparse here. Tell what card, from what device, size, if it ever worked and if from a digital camera/device did you format the card in the camera and try it again?
I have a dell inspiron 1521, with windows vista AMD turion 64x2. The problem I am having, is when I put my memory card into its slot, it never reckonizes my card. can someone please tell me what to do?