How to repair a bad block on internal hard drive?

I've just performed a surface test on my internal HD
It reports back one bad block, at # 1, 118, 671, 700.Filename = N/A.
1. Should I be concerned about this? I have not noticed any performance issues.
2. If I wanted to get rid of it anyway, how do I repair that bad block?
Please advise.
Many thanks.
/gh

Good to know this happens automatically.
Is that something OS X automatically does on startup, or on shut down, or in background?
But in this case, that automatic feature seems to have missed this block. Else the bad block would not show up in the utility, with a file in it.
Or ,,,,perhaps it still shows up as a bad block in the utility, even though it's been mapped out.
If that's the case, then I guess I need another kind of utility that would report the block has been mapped out....
Any suggestions?

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    25 00 80 c0 93 98 e0 00 1d+01:30:14.100 READ DMA EXT
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    # 2 Short offline Completed without error 00% 26717 -
    # 3 Short offline Completed without error 00% 26717 -
    # 4 Short offline Completed without error 00% 26717 -
    # 5 Short offline Completed without error 00% 26716 -
    # 6 Short offline Completed without error 00% 26715 -
    # 7 Short offline Completed without error 00% 26714 -
    # 8 Short offline Completed without error 00% 26697 -
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    #19 Short offline Completed: read failure 20% 26643 296909
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    #21 Short offline Completed without error 00% 26618 -
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    2 0 0 Not_testing
    3 0 0 Not_testing
    4 0 0 Not_testing
    5 0 0 Not_testing
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    Regards
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