Imagine you buying a computer game. Nowadays most of them come on a DVD, some they have a couple of GB of files. When the game is installed on your hard-drive, those files get written all over the place. And that's just a small example, because with the fast internet connections these days, files get downloaded, copied, moved all the time.
Being all over the place, your hard-drive gets slowed by jumping from place to place to retrieve those files. But in just minute (depending on hard-drive capacity - can take hours) you can increase your computer's overall performance.
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