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I've run sudo badblocks -sv /dev/sdb1 on my desktop's 1,5TB HDD and it found 86 errors.
This is the output I got.

Also, this is the output of gSmartControl.

Is there any way to find which files/folder are affected and try to save them?

Should I be looking for a new HDD?

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What makes you think something needs saving?Bad sector are reallocated, and the system knows not to use them henceforth. No user intervention is required. –  mikewhatever Jan 14 '13 at 20:48
@mikewhatever: A thing that alerted me to check the disk for problems was that I tried to watch an episode of a series and after a minute the program would stop working (freeze). The problem is that I have watched the video already. I was in windows, and the problem arose. Then I booted at Ubuntu and the same behavior turned up(vlc player). So when are the bad sectors reallocated? –  Chris Jan 14 '13 at 22:56
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