I bought these same cards, but my ink would pool on top. I'm thinking I got the wrong set of cards... Were yours glossy on top? Or do they have a bit of texture?
I'm in the same boat... I can read all day long but not write. I get the I/O error, and when I try and use a built in card reader I got the error that the "Media is Write Protected" any thoughts?
When I took my back cover out, it looked like there is quite a bit more room. There is this in the mean time, but it is ugly as sin: http://www.ign.com/boards/threads/nyko-u-boost-gives-double-battery-life-to-wii-u-gamepad.452771249/