Problems with 4gb kingston memory card

Ok, so I got this new memory card. Then I when to format it to try it out. So, I placed in a few files into the memory card but when I placed the memory card into my ds, but it cannot be read.
In case you were wondering I am using this, http://eng.supercard.sc/images/sc_lite.jpgIs it because of my card reader? Am I only allowed to use the micro sd card? Please help!

Have you installed firmware? Read this; https://www.romulation.org/forum/index.php?topic=1462.0