I transferred a number of MP3 files to my SD card via USB. The audio player could see them but will only play about half of them. The others display "Unable To Play This Type of File". I turned off my EVO. Tried unmounting and remounting SD card. Downlowded another audio Player (PowerAmp), with same issues. These files are from my ITunes library. They are all MP3s. They are different bitrates, but I wouldn't think that would make a difference. I just dragged them over from a Windows 7 computer. Any Suggestions?