[ubuntu] Lost partition: Not detecting

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http://ubuntuforums.org – Im running Ubuntu 11.10 from the USB stick. I have a 2TB internal HDD which has 2 partitions of 1 TB each. Problem is that Ubuntu here is detecting only one of the two partitions. I cant see the other partition in Gparted or in the 'Disk Utility' App. Its kind of a lost partition which I want to bring back. Please help me detect and mount it. :( I hope all the data on other partition is safe. Thank you (Hardware)