Resue disk after accidentally erased

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http://forums.fedoraforum.org – |I have a data disk with ext 4 file system on it. When I tried to install FC17, I inserted this data disk and got passed the write data to disk step before I aborted the installation. What is now the best way to rescue the data on this disk? Any help is welcomed, I have most of my data and over 200 research papers months that I have collected over last 6 months for my graduation project. Losing all these will push my graduation back at lease 3 months. :( Thanks in advance!! (HowTos)