Hi, juat bought my rns510 about 2 weeks ago now, am starting to fill the hdd up via itunes, have my folders like this Aritst, then inside, albums, then songs, and im copying one artist folder ate a time, but everytime i copy over i get 2 sets of what i have copied, i perfect, and one with a "_" infront of every song title, and have to go through and delete the wrong ones one by one, hope you can help!