Mobile device requires USB Type-C port and On-The-Go (OTG) support. Free up space on your USB Type-C smartphone. Download and installation of SanDisk Memory Zone app required. High-performance USB 3. 1 Gen 1 drive with 150MB/s read speeds. Write speed lower and vary by capacity. USB Type-C port with USB 3. 1 Gen 1/USB 3. 0 support required. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors.