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These high capacity Micro SD cards are absolutely fantastic for adding extra storage to the newer MacBooks, especially considering that the newer ones are almost completely un-upgradeable. With one of these in the SD slot, however, you get an easy extra 400 GB to use, and all for around the same price or less than a SSD drive would cost you. Works great for me, I've had 0 issues with it. This is a genuine SanDisk product.