Thanks for all for your various comments.
Special thanks to ones making positive & hioeful comments.
@ uksv29....
Its HITACHI External Hard Drive 1 TB capacity. It is externally Powered as well.
When I connect to PC, the light comes up and the hard disk sounds like its trying to read but fails.
I have a hope that I wud be able to recover data. Even loss of some partial data is acceptable to me.
Now, I wanna know the exact person who can help me. I am willing to visit along with the disk.