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manufacturer's tool found bad blocks, but smartctl doesn't show any

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http://unix.stackexchange.com – Description of my problem is quite large, so first I will give a short summary, then I will precisely describe the situation. Short summary: manufacturer's diagnostic tools found and repaired some errors on my hard disk. As far as I understand tool's manual, these errors were bad blocks. However, smartctl (Linux tool to do SMART on hard disk) doesn't show any reallocated sectors and says that hard disk is good. First question: how is it possible? Reparation of bad blocks means reallocating sectors, right? So why don't smartctl report any reallocated sectors? Second question: I bought this dis (HowTos)