Ive just added a third harddrive to my system and i cant manage to format it because it says "volume is in use" ive tried going to disk management and doing it that way too, any help? 
EDIT: i think i may have formatted it using some software , however the full 153 gb isnt showing, 3gb is taken up by nothing ? any ideas

EDIT: i think i may have formatted it using some software , however the full 153 gb isnt showing, 3gb is taken up by nothing ? any ideas
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