Anyone know what this means and how to do it?

After running TechTool over an iMac it found one bad sector on the  
hard drive.  In the past it would "sequester" that sector so it  
wouldn't be used, however in this case I got wording similar to this  
(don't have it exact).

It said that I had a bad sector and the only way to repair would be to  
"zero out" the hard drive and reinstall the operating system.  Why it  
would not sequester I don't know, but what is "zero out".  Would that  
be using the utility portion of the install disk to "erase" the hard  
drive or it is much more involved?

Many thanks for your help.

John


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