I bought a 64gb Class 10 Samsung micro sd card to use with my s4, and it transfers music from 1kb/s to 50kb/s and it is making me desesperate because my music is in FLAC file format and takes forever, i have no idea what can the issue be, im using the microsd to usb that came with it, tried plugging it in my 3.0 USB port but PC doesnt recognize it, 2.0 does but transfer speed is ridiculous. my PC is good, has an i5-4570 CPU.