How to get al the disk space for ubuntu 12.04

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http://askubuntu.com – Recently I changed for Linux Ubuntu 12.04, I left Windows and I want now to get all my hard disk space, cause when I formatted my PC installing Ubuntu 12.04, I only gave Ubuntu 23.0 GB and now I'm only using Ubuntu 12.04 and I want to get all my hard disk space (Before called Windows; hard drive C and Hard Drive D). How can I do this? Do I have to use terminal? Thanks . (HowTos)