Corrupt iMac HD running Lion

I have a corrupt hard drive that DU can not repair.  How do I know which format to choose from dropdwn  menu to erase the disk?

Thanks, rkaufmann87, appreciate all your help!  Tech Tool Pro has found over 800 bad blocks and is not even half way thru the surface scan.  Do you think there is any point in continuing the scan, or should I just make a genious appt to have the HD replaced?  I have no confidence in my ability to replace it myself.  Thanks again.

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    Buswab wrote:
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