What does disk fragmentation do? And roughly, how long does it take?
Disk fragmentation is when all your files are not in the right place. When you De-frag a computer it sorts through those files and puts them in the right place. This helps by making your computer faster and stall less. It normally takes about 30 minutes for me. It all depends on how much memory is used on stored files. Hope I helped and have a great day!