We’ve all probably heard the advice from geeks that we need to defrag our computers now and again to keep them running efficiently, but what is defrag?Defrag, sometimes called defragging or defragmentation, is the process of cleaning up the files in your computer, by taking all of the file fragments that have been scattered across your hard disk, and rejoining them into files that occupy the same area. The result of defrag is that it will usually speed up your computer, saving you time and also extending the hard disk’s lifetime. While defrag can sometimes be a time consuming process, it is nevertheless a regular component of computer maintenance.In order to fully understand what is defrag, we need to know why it is performed. Most people think that their computer stores files in the same...