Had the same problem i while back. Solved by putting the SD back to Eken and go to the setting, unmount SD and format it with Eken. Then it should work fine with linux/windows again.I have a strange bug that is present when connecting my M001 to both Linux and Windows (7 x64) whereby the SD card will be mounted as read-only. I thought perhaps it might be the card itself being locked but connecting it through a card reader gives me full permissions.So it seems that my M001 (running Slatedroid v1.3) is locking my SD card. It has functioned normally up until now.