30 USB portISO9660 Level 1, Level 2, (Romeo,Joliet).MP3 and WMA files written in anyformat other than listed above maynot play correctly, and their filenames and folder names may notbe displayed correctly.■ The following restrictions apply forthe data stored on external devicesconnected to the USB port:Maximum folder/playlist number:5000.Maximum file/song number: 15000.Maximum file/song number perfolder/playlist: 6000.At least 8 folders in depth hierarchyare supported.WMA files with Digital RightsManagement (DRM) from onlinemusic shops cannot be played.WMA files can only be played backsafely, if they were created withWindows Media Player version 9 orlater.Applicable playlistextensions: .m3u, .pls, .wpl.Playlist entries must be in the formof relative paths.The system attribute for folders/files that contain audio data mustnot be set.Playing saved audio filesMP3 player, USB drive, SD cardPress the MEDIA button once orseveral times to activate the audioUSB mode.Replay of the audio data stored on theUSB device is started.The operation of audio data sourcesconnected via USB is the same asdescribed for an audio MP3/WMA CD3 24.iPodPress the MEDIA button once orseveral times to activate the iPodmode.Replay of the audio data stored on theiPod is started.The operation of the iPod connectedvia USB is mainly the same asdescribed for an audio MP3/WMA CD3 24.