Modern smartphones, tablets and many others mobile devices lose half of their capabilities without a properly selected memory card. Unlike many other cards available on the market, the Polish manufacturer has implemented UHS-I interface capabilities in these media. According to the SD Association specification, Class 10 cards should be characterized by performance of no less than 10MB/s. However, in the case of modern phones, tablets or media players, not only the speed, but above all the way to control the flow of data is of paramount importance.