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 What file formats do my media player support? How do I convert files? How can I improve the bad recording quality of my media player? My music player cannot be charged. Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started