I download all my tv shows on my laptop and whenever i finish watching a few i move it to my MacPro. I have around 90G worth of movies/tv shows on my laptop, once i finish watching for example the daily show i would delete it but i would keep other tv shows. Do i need to defrag my laptop and if so how and how often? I am told that i have to do so only if i transfer lots of large files often. Thanks in advanced.