[ubuntu] Quick questions before getting started.

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http://ubuntuforums.org – Switching to Ubuntu. I am running windows 7 and I use two main programs cc cleaner and disk defraggler. Do I need similar programs for ubuntu? If I recall correctly from my research Link doesnt use the same file storage as windows and thus never needs defraged is that true or false. Also is there a similar program to cc cleaner for ubuntu? And lastly are there any tools you guys suggest to keep my laptop running at optimum performance or tweaks maybe? (Hardware)