Rajji.. I wud suggest u to run Zero Level Format(AKA flow level format).. it repair almost 99% of bad harddrive then u wud be able to use that hardrive as External HDD for Data storage... u just need to purchase a Casing for that harddrive wud cost u only $5 (Around Rs 200).

The prob is we don't have so much of technical knowledge...........so it is difficult for us to get these things done ourself...........so we did what the engineer told us to do......n he suggested to replace the hard disk.....

Zero level format nahi aata