I had a Neo Freerunner (2008ish time frame). So many SD card vendors ship (or shipped, then) bad/broken/out of spec SD cards whose controllers just barely work on Windows, Linux distros' drivers didn't work around the quirks, and probably the Freerunner SD port wasn't that great electrically. End result 8 out of 10 SD cards wouldn't work at all and one of the remaining two would fail silently later. I have still have a little box full of microSD cards.