Two possible reasons:
Most likely you have songs with illegal characters in the name - they might be valid for Window but not for the Honda Entertainment Center.
Also there is a length limit for the full path - if you folder name is too long or the song name is long that will cause it to be dropped. I think it is either 64 characters or 88 characters max file name - any longer and it is not saved for playback.
If a folder hits either condition it stop scanning that folder at the entry.
Also any song with DRM is not playable (Digital Rights management) on the Honda Entertainment Center. That is most Apple iTunes songs.
Most likely you have songs with illegal characters in the name - they might be valid for Window but not for the Honda Entertainment Center.
Also there is a length limit for the full path - if you folder name is too long or the song name is long that will cause it to be dropped. I think it is either 64 characters or 88 characters max file name - any longer and it is not saved for playback.
If a folder hits either condition it stop scanning that folder at the entry.
Also any song with DRM is not playable (Digital Rights management) on the Honda Entertainment Center. That is most Apple iTunes songs.