[ubuntu] is it possible to transfer existing ubuntu OS from one hard disk to another?

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http://ubuntuforums.org – Hello, I currently have the older version of ubuntu 10.04, and wish to upgrade my hard disk that it is on. Its currently on a 300GB Sata drive. But I wish to now transfer the OS onto a 120GB SSD hard disk, as its much faster! The ubuntu partition is only 100GB so it shouldnt be a problem. But how would I go about doing this? Is there some utility i can use? I am assuming its not a simple copy all files to the other hard disk task. (Hardware)