How to recover data from corrupted external hard disk?

How to recover data from corrupted external hard disk? when I am connecting hard disk to laptop its asking for format & showing I/O device error while trying to open it.
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  1. Please do not post duplicates. Post once and wait for replies.

    I have replied with a suggestion to your first post here: http://www.tomshardware.co.uk/answers/id-1890801/recover-data-corrupted-external-hard-disk.html#11990973
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