Note that some solid-state drives have two gaps but the transmission protocol is SATA. This product only supports 2230 2242 size M.2 NGFF interface with PCIE x4 AHCI or NVMe transfer protocol solid state drive (solid state drive has only one gap) and 2230 2242 size PCIE x2 AHCI or NVMe transfer protocol solid state drive (such solid state drive There are two interfaces, but the transmission protocol is NVMe or AHCI. M2 SSD Adapter For Macbook A1708 NVMe M.2 NGFF SSD to 2016 2017 MacBook Pro A1708 SSD Adapter Card for Apple Macbook 1708 Laptop