Hi Piyush Sukhija,
I am sorry to hear about it. Based on your post, it's a hardware issue. For data recovery, you can try the data recover software’s. If the data is very important and you want to recover it, there is possibility to cover by data recovery companies.
Here is a link for data recovery companies.
support.wdc.com/recovery/index.asp?wdc_lang=en .
Hope it helps.