I am new to the ROMs, I am testing right now my N-Card 8Gbit, so after some hard work and a lot of pain I was able to get it to load several ROMs, but some wont load... I got some ROMs that will work nice which were identified as (U), there are (E) which I have not tested yet... so despite everything else, I want to know if they are created at the same level or at the same point, why will some give the error of "Could not read Data. Turn off the System and reinsert the GameCard." Dont know if this is regardingthe ROMs or the save files...? Any suggestions on how to fix that problem? What does the (U) (E) mean? Please let me know, thanks.