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windows - How to do a low-level format

I have a hard disk which has some bad sectors on it. And it said when I booted in Linux mint that I already need to replace the hard disk. But I don't have yet the money. I'm just a student. How do I do a low level format? What do I need to do before trying to do it?Is there a particular time span until all of the hard disk breaks down and lose all of my data wen it has already bad sectors on it? How long will a low-level format take, for a laptop with 2Ghz core 2 duo processor and 2Gb ram.

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