People of the older and middle generations who have now caught rare drives (for floppy disks — floppy disks) and the first hard drives know very well what disk defragmentation is and why this operation is necessary. If you did not control the performance, then you could very quickly get a faulty system. Take at least hard drives that had to be reformatted periodically, otherwise due to thermal expansion and the displacement of the read heads relative to sectors, you could get a read error message. In addition, defragmenting the hard drive was just as necessary as controlling free space.
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By the way, what is disk defragmentation , Windows 7 "knows" very well, therefore, by default it runs on schedule. Such programs not only optimally place files, removing "holes", but also move the most requested data to the external radii of the disks.