I was copying my MP3 library to my ps3 via USB flash drive. After I finished I see that I have about 500 extra songs out of 1600. I sort by artist and right away I see duplicates of songs. In artists folder that shouldn't be there. An example would be an Alan Parsons song in the 10CC folder AND the Alan Parsons folder. I remember when I first got my PS3 I was having the same kind of problems either by copying them over the network or by flash drive. Back then I just went through and deleted the duplicates. I don't want to do this from now on. Every once in a while I just want to delete my library from the PS3 and copy it back over so that I make sure all my music is there.