HDD runs for sometime and then disappears from 'My Computer'

Hello everyone,

I have a 3TB WD External Non-portable (the one with power adopter). It was working fine until recently I disconnected the USB cable while windows was still shutting down. Now the drive runs only for a few mins and then it disappears from 'My Computer'. I am using Windows 7 64bit.

I don't want to lose data but want the drive's functionality to get back to normal. Is there anything I can do from my home?

Any advice would be highly appreciated.

Thanks in advance.