Hi there Rajesh Babu Bobbepalli,
You need to try something simple as just changing the cable. If this doesn't work though, given the fact that you have tried the device on different ports and systems, there are two possibilities: 1)there is something wrong with the enclosure 2)there is something wrong with the HDD itself.
- Option 1: RMA the drive. You get a new one but you loose your data. "I'm ready to give hard disk to seagate company but will they give another one with data?" I doubt that you will get a new drive with your data.
- Option 2: You contact the manufacturer and request some sort of data recovery service. This could be pricey.
- Option 3: Take the drive out of of the enclosure. If the issue is enclosure related, you most probably will be able to access the data when you connect it internally through SATA. Though, this will void the warranty and you do this on your own risk. After that you can put the HDD in a third party enclosure I guess.
Cheers,
D_Know_WD