How to defragment your hard drive
Unless you're using an SSD, your system will eventually suffer from performance loss when the data stored on your hard drive becomes fragmented. There's no reason to worry when this happens – it just requires a simple fix.
Hard disk drives fragment data because they are "random" by nature. Consisting of an actuator, platter, spindle, actuator arm, and read/write head (among other parts), hard drives work by storing and seeking out information on a rotating disk. When data is written (stored), it's written to the first empty portion of the drive that the write head is able to access. When a hard disk drive has written a significant amount of data, it becomes harder and harder for the drive to find all of the information or programs you want it to access in a timely manner. By defragmenting your hard drive, you can help it run more efficiently and enable faster access to data.
The best way to "defrag" your hard drive is to use the Microsoft Windows® Disk Defragmenter utility. Follow these quick steps to defrag your hard drive.