Before any uploads are finished, Pop Hits discs are numbered by year then month, Eg 0905 (2009 May) with the codes AC - Adult contempery, C# - Classics, M - Monthly, MR - Retro, N - Nashville, PT - Phat Trax, R - Rock, T - Today, GH - Greatest Hits and U - Urban. Depending on your collection they are labeled either PHM or PH____M. So you should only have 12 discs of each type per year. Hope this makes sense to everyone. I usually leave it to BJ to explain the DiscIDs!