I'm having an issue with using my formatted card on my mac, as soon as I insert it in my machine, it says that the disk isn't readable, which I suspect is similar to what you were seeing. I'm trying to follow your instructions but the partition icon on disk utility is greyed out and won't let me create. Is there any way to fix this?
I've tried formatting the sd card a number of times, but no difference, any ideas?
J
