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 can't I find or delete files in the music player? The FM function of my MP3 Player doesn't work properly as it can only detect one or two channels. How can I improve its reception? My music player cannot be charged. Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started