Notebook hard drive reading is slow what's going on?

Notebook hard drive reading is slow what's going on:

We have a system disk as an example, to clear the disk fragmentation of the system disk, you can clean up the pieces of each disk!

The first step: Right click on the system disk, click Properties!

Step two: In the General options we click on the Disk Cleanup! The computer will show how much space is being calculated to free!

The third step: we choose to clean up the files to remove the removal! In the general options, we can choose to remove the unused programs!

Fourth step: We in the computer properties of the tool to click on disk defragmentation!