dumpe2fs command

I think my file system has been damaged. Instead of block 1, I want to use block n as superblock. How do I find out an alternative superblock location under Linux?

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Q. How can I Recover a bad superblock from a corrupted ext3 partition to get back my data? I’m getting following error:

/dev/sda2: Input/output error
mount: /dev/sda2: can’t read superblock

How do I fix this error?

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