Many years ago when hard drives were very small a drive would get defragmented - but the last drive we saw that needed defragging was over 15 years ago.
It doesn't help. In fact, if you have a Solid State Drive, it can cause harm!
This rather old article explains computers and defragging well https://aplawrence.com/Basics/Why-defragging-your-computer-may-be-a-waste-of-time.html despite it's age. But what they conclude is that most people do not need to defragment but some may do - these days (7 years later) I would change it to almost no one needs to defrag.
Forget defragging - there are many other things to speed up your computer. For example, do you have a Solid State Drive in your computer? Have you got enough RAM (Random Access Memory - also known as "memory")? How good is your power supply - an efficient and powerful power supply can make quite a difference to your computer. There are many things, big and little, that can affect the speed of your computer. Ask Computer Help NZ, we can help you get your laptop or desktop going quicker than before.
Check out our video on this https://www.youtube.com/watch?v=HaNWi_anIvc
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