How can i get my MacBook Pro to output a 120 hZ signal to my TV?

I have a 2012 MacBook pro and an Insignia 120 Hz television.  I would like to watch movies/play games on my TV in 120 hertz.  What cables do i need, and what do i have to do to get this to work.  It currently shows that the highest refresh rate i can reach in the display settings is 60 Hz.  Is this because of the cables i'm using?  I currently have the rocketfish minidisplay to hdmi adapter hooked up to a hdmi cable to the tv.  I have read other discussions relating to this issue but they got congested with people's personal issues.  An approach i saw to getting this to work was by getting the Mini-Display port to Dual-Link DVI adapter. If this is the best means of accomplishing my goals, where do i go from there?  And please, no bull****.  If you know the answer/could help, help; if you don't know the answer, don't post. 
Thanks!

You have to format it first using Disk Utility.

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