When you purchase through links in our articles, we may earn a small commission. I love the NFC security, I love the clip-on functionality, but performance with this 20Gbps SSD is sometimes more like 10Gbps. I love the style, NFC security, and integrated belt clip on the Adata Urban TapSafe, but its overall performance is underwhelming for 20Gbps. Adata's Urban TapSafe 20Gbps SSD is unique in that you can clip it to your belt, and once security is enabled you can unlock it using your phone's NFC capabilities -- both eminently handy traits in certain situations. The downside is that it's not a very good performer for 20Gbps with anything but small data sets.