• MP3 files in MP3 PRO format cannot be played.
• The audio file is a multiple track audio file.
• Some AAC files may not be played correctly.
• WMA files in Windows Media Audio Lossless and Professional formats cannot be played.
• USB devices formatted with file systems other than FAT16 or FAT32 are unsupported (*).
• If you use a partitioned USB device, only audio files on the first partition can be played.
• Playback is possible up to eight levels (including the [ROOT] folder).
• There are more than 256 folders (including the [ROOT] folder).
• There are more than 256 files.
• Files that are encrypted, protected by passwords, etc. cannot be played.

^* The receiver supports FAT16 and FAT32, but some USB devices may not support these FAT systems.
For details, refer to the operating instructions of each USB device or contact the manufacturer.