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Even if you mark them and those sectors dont get used, but still it usually only gets worse. HDD's prices have gone down, its better you even buy used one from eBay or something, then trying to fix this, coz thats a lost case. :-)
Only thing you can do is to put it through a low level format, it might take a little while depending how big is the drive?
But in the end all bad sectors will get marked.
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