I am trying to restore some documents from a backup on an external HD. I start the wizard, point to the backup on the external drive, tell Acronis where to put the recovered files, click next and get this message: Warning! W00040011lease insert the media marked "Volumn 1" Press retry when ready or press Cancel to cancel the operation. Since the backup is on an external drive, why do i get this message? What am I doing wrong?