Unusual disk activity

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http://forums.fedoraforum.org – Hi I have been using Fedora on my laptop for around one year and it was working very well in general. However, during the last couple of days I see that my disk is almost always active (the LED is on) and the system is extremely slow. For example Firefox freezes due to this load. I was wondering what could have caused this and how can I trace the issue? I am not an expert and that's why I am asking this very basic question here! Thanks in advance, (HowTos)