See also:

Root Directory
The root directory is treated as a folder. If the root directory has compressed audio files, the directory displays as No Folder or ALL. ...

Empty Directory or Folder
If a root directory or a folder exists somewhere in the file structure that contains empty folders and no compressed files in them, the player advances to the next folder in the file structu ...

CUE and ATS technologies
The ATS is offered with Cadillac CUE, a comprehensive, in-vehicle experience that merges intuitive design with auto industry-first controls and commands for information and entertainment data. It ...