My HD in disk utility shows free space of 200GB and is greyed out. I am unable to do anything with this free space.

I dual booted my mac until recently with refind. It all worked fine until recently when i tried to remove the ubuntu partion as I did not need it any more.
Unfortunately, I am now not able to do anything to the 200GB of free space that shows in disk utility. Please help.
I use Yosemite now.

worked it out. thanks:)

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