External USB Drive

The manual states that I can connect an external usb drive to my Apple TV and that iTunes wil automaticly store my music, movies, photo’s etc on the external drive.
I set the iTunes Storage to External but when I use an FTP-tool, I cannot find my music files on the external drive.
Is there something I Mmissed here??

Kind regards,

You can view the contents of the external drive by following the guide here:

Ok thanks,
But where can I see the music files?