Aslo It is designed to only fit in the N770 so people do not try to use it in other mobile devices. I am not sure what would happen in other mobile devices.
I will make a USB reader available once I find out where to get the one I have in bulk. It is the kind with the trap door that opens up. When you put the card in, it can be pushed out with a push slider on top. You can also use it as a thumb drive.