how to allocate more disk space for my fedora on dual boot system

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http://forums.fedoraforum.org – I have 500GB on Lenovo T510, right now I have allocated 400GB to Windows 7 and 100GB to Fedora, as I have too much files under fedora, I feel I need more HD space under fedora. How can I allocate another 50GB from NTFS to fedora disk. And I dont want to touch functionality of either system. Detailed instructions appreciated. (HowTos)