3TB My Book Essential I/O Problem

I recently bought a new 3TB Hard disk. I got replacement from WD Because its not working. Then replacement hard disk working but when I already transferred 2000GB and transferring more, copying file gets slow and system hang. 

Then I restart it and now its doesn’t showing my hard disk. 

In disk management its saying I/O Device error. I already tried new cables.  This same problem occur in same 3TB hard disk new now and now its comes in Replacement one same problem.

Why I’m getting this problem?

Light is coming on hard disk, its showing My Book on safely remove. 

Hard disk is spinning. What can I do to make it run???

Have your port of the comp checked by a technician