Running HDtune..need advice

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Howdy,

So i am running HDtune as we speak, i am running the error scan portion of the software which scans the surface of the disk and defects show up as red. I am 3/4 of the way through it and have ONE red sqaure out of the whoel 160GB disk ( i say that but it will prob end up being about 30 )

Is it necessary to replace the whole disk if i have ONE red sqaure of defective....ness..

Id like to hear your thoughts...what would you do?

A side note is that the ONE red sqaure i had (out of ALOT of sqaures) was right at the beginning..any idea as to what this could correspond to?