Hard Drive overheating on ubuntu, not on windows

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http://askubuntu.com – I have a dual boot laptop, of lubuntu and windows 7. I really like ubuntu, and I rarely boot on to windows 7 now. However, one issue that I could not resolve, was that my hard drive heats up on every ubuntu variant that I have tried. I already have tried cleaning dust out of my laptop,and proprietary graphic drivers (Nvidia Gt540M) are installed, and bumblebee is running well. I have googled around for a solution, and have experimented with laptop-mode-tools, and powertop. They did little towards solving the overheating issue. My hard drive still hits 60+ degrees celcius when running on AC. (HowTos)