Disk space management problem

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http://askubuntu.com – I have my pc with dual boot Windows 7 and Ubuntu 12.04. I have a a partition of 62 GB on which I created a Virtual Hard Disk Image using VirtualBox from within Ubuntu and Installed Joli OS. After I uninstalled Joli os and uninstalled Virtual Machine, I still Can not recover the disk space that was occupied by the Virtual Disk Image though I am unable to find the Virtual Disk Image. Can someone help me and tell me how to solve the problem? (HowTos)