Bootcamp - Lost 200GB as Bootcamp froze on "while partitioned" for 5~ hours
The 200 GB of your hard drive spaces were partially formatted with NTFS and went unrecognized due to a failed installation. There are couple of options which may work out. First: A fresh install of the OS X after you have backed up the Macintosh HDD. Second, a third party software that can reformat the 200 GB of HDD space to OS X Extended Journaled.