The SD memory card is just perfect for adding space on its Macbook Air without having to lug around a bulky HDD External and power hungry :) Indeed once slipped inside the SD slot, the card disappears (almost) completely to let appear a thin black plastic blade-like and recalling the keyboard;) But it gives a little bit of trouble to remove :( Indeed when we want to insert another SD card, so dear to our NPC, to transfer photos and videos (why I use a SD to USB adapter now). Also when the MBA stands by sudden power fault and that restarts the system after turning over, an error message appears indicating the ejection of the card inappropriately or forced to remove reinsert the card; either restart the MBA. This discomfort is minimal, you just have to have the time, but this is the only flaw I noticed it (except that I wish I had more capacity as 256 512 see go: ) and the read-write speed is much slower than the native SSD (MBA mid-2013). That is why for that price this card remains the best alternative to significantly increase the storage space on his machine: D FIVE STARS ***** EnjoY!