I have a WD Passport USB drive connected to my WD TV unit and it contains a mixture of various mp3 audio files and various formats of video files. When I initially connected the drive it took over 48 hours to build the media library but it finally completed. I can now see all of the various video files as I traverse through the directories, but none of the mp3 files. Some directories contain only video files, some contain only audio files, and others contain a mixture. However, that doesn’t seem to matter and the mp3s are never visible in the directories. However, when I view the disk contents on my computer over the network all of the files are there.