I bought the card to the memory capacity of my Macbook Air to expand on the Nifty Drive - but it seems as though this card to put in operation minimally thick or unevenly thick and thus somewhat tricky with the Nifty. With a smaller card from a different manufacturer, I had no problems with the Nifty Drive - but I guess that is ehr to the sensitivity of the drives and not on the map. Trotzem I would have liked a more detailed product description. Therefore, a star deduction. Meanwhile, the card runs though - but you need time and again several attempts to the MacBook Air, the Nifty with the card recognizes.