One of the most effective and useful tool to speed up the performance of your computer is to defragment your hard drive. Defragmentation of the hard drive is referred to rearranging the scattered files stored in your hard drive. Actually the data you store in your hard drive increases with the course of time. Then data becomes scattered in the hard drive and needs arrangement so that computer can easily access and run programs from the hard drive. If data is arranged with the help of defragmentation then computer easily access the data and thus requires less time to access and run the programs. Remember that the files stored on the hard drive are in fragmented form. These files are very hard for the computer to open and run. That is why computer supports the defragmentation tool because it helps a lot to let the computer open and run the files.