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 How can I listen to the source audio while line-in recording? Why does Transcend include the Proposition 65 warning? Why isn't the countdown for the remaining recording time of my Digital Music Player running? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started