2010 Chevrolet Avalanche Owner's Manual - Page 314

USB Supported File and Folder Structure The radio supports: ... Empty Folder Folders that do not contain files are skipped, and the player advances to the next folder that contains files. Up to 700 folders. Up to 8 folders in depth. Up to 65,535 files. Folder and file names up to 64 bytes. Files with an .mp3 or .wma file extension. AAC files stored on an iPod. FAT16 FAT32 No Folder When the disc contains only compressed files, the files are located under the root folder. The next and previous folder function does not function on a disc that was recorded without folders or playlists. When displaying the name of the folder the radio displays ROOT. When the disc contains only playlists and compressed audio files, but no folders, all files are located under the root folder. The folder down and the folder up buttons search playlists first and then goes to the root folder. When the radio displays the name of the folder the radio displays ROOT. Root Directory The root directory of the disc is treated as a folder. If the root directory has compressed audio files, the directory displays as F1 ROOT on the radio. If a disc contains both uncompressed CD audio and MP3/WMA files, a folder under the root directory called CD accesses all of the CD audio tracks on the disc. 4-106