[Unformatted external HDD has been connected. Format the HDD?] appears when you connect an external hard disk drive to the EXT port on the rear panel of the HDD AUDIO PLAYER.
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You are connecting an external hard disk drive that has a file system which is not supported by the HDD AUDIO PLAYER. You cannot play music files stored on the external hard disk drive.
Any music files stored on the external hard disk drive will be deleted if you format the external hard disk drive using the HDD AUDIO PLAYER. Also, you won’t be able to use the external hard disk drive with other devices such as a computer, because the external hard disk drive (USB storage) is formatted only for the HDD AUDIO PLAYER.