I was informed of this opinion a while back by a friend who is a computer tech: "Defragging flash media is at best unnecessary. Flash does not have to 'dart all over' like mechanical drive seek heads do if the info is in non-adjoining clusters. Regardless of where the data is, in a flash drive the seek time is almost instantaneous. In fact, because of the built-in 'wear leveling' of flash drives defragging them can even be counter-productive and life-shortening". Just repeating what he told me in an email.