Will it make any difference in data transfer speed if I use Class 2, 4, 6 or 10 micro SD card on MP860/MP870? Category : Setup / Operation "No matter which class of micro SD card you use on MP860/MP870, the read/write speed would be the same.Note: the speed here refers to the direct read/write speed of the MP860/MP870 to the micro SD card, not the computer's." Is the answer helpful? Related Why is my media player not responding or not functioning properly while connecting to the computer? Why can't I find or delete files in the music player? In what order are songs played in the digital music player? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started