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I used the following utilities to check my ext4 partitions:

  1. fsck
  2. badblocks

Google and SO also suggest smartctl. I'm just wondering what are the differences between all those tools and which one is better.

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There is no way to repair bad sectors. They are automatically marked as unusable, without user intervention.

To find out what various programs do, see the man pages, for example:

man badblocks

man fsck

man smartctl

You don't have to read everything, just the description.

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