I just bought my 15' ST2 about a week ago and began ripping some of my cd's to a thumb drive. I've ripped all my cd's using dbpoweramp into mp3 format and made sure the artist and album tags are correct, but my car will not recognize about 75% of the cd's I have ripped. I'm stumped as to why they will not read. It's not even coming up in an "unknown" file or folder. Before I put my music on the thumb drive, I did format it. I tried to do a search, but I cannot find any similar issues.