Just imagine you do have a large home library of books arranged in volumes. Also imagine that you will re-shelves the books in a way which moves the individual books in the volumes further apart from each other. If you do buy the new books that's mean books are added to library, the further apart and more mixed up the books in the volumes become. Now imagine that you come to the library and want to check out an entire volume of books. You would have to search all over the library to find each individual book in the volume that you want. Well, it sort of all your cooking books, drawing books are mixed up with your kid's comic and their drawing color books. In computer terms, what is happening when the individual books are re-shelved in this way is called fragmenting, and this is what happens to your computer as you install programs, download files, or just use your computer in general.
When running programs that contains hundreds of files, fragmenting can degrade the performance of your computer. As the clusters of files on your hard drive become fragmented, they grow further apart and it takes longer for your computer to find and assemble all the pieces necessary to run the programs. This is where defragmenting comes in. It rearranges the files on your hard drive so they are back in order, which cuts down on access latency (the time it takes to access your files). It just like you do the re- shelve the books in your home library and make them into one specific topic to make it more easy to find. This could greatly reduce the time it takes to find whole volumes or individual books in those volumes.
I think you do understand very well right why should we defragment our hard drive?? :) But I do have one more tip when you are doing the degfragment processes.Close all programs when you are defragmenting the hard drive. Why?? As a good analogy for this case is, when you are re-shelving the books, the kids come and take the books. Thus, you can't arrange the books on the right shelve and your kids will put the books in any shelve that they wish to!
I hope this article is good for very body and help you guys out there!!