 In modern computers, with SSD "disks" that do not rotate and are not really discs in the conventional sense, file system fragmentation is not as much of a performance problem (that should be "fixed"), as there is no movement of heads or discs.In fact, overly defragmenting such drives can slowly shorten their lifespan.When a file system is first initialized on a partition, it contains only a few small internal structures and is otherwise one contiguous block of empty space.