NOTE - According to the packaging "Late 2013 model onwards"
Memory expansion on Macbook quite einfach.Habe a SanDisk SDSDQUAN-064G-G4A Ultra 64GB microSDXC UHS-I Class 10 Memory Card installed. Memory card has been detected as usual. Memory expansion up to 128GB possible. The only drawback is that you Requires to remove the Nifty tool. But a BÃ'roklammer should normally also work.