If one copies data from a full external 8 TB or 5 TB hard drive to an empty 8 TB hard drive how could one make sure that the data of the slow area (inner area) of a drive is not copied to the fast area (outer area) of the other drive but from the fast area to the fast area? So from fast to slow or vice versa would mean to get a slow speed instaed copying from fast to fast area with a faster speed. At least for half of the data or so.