i think now everything looks good after updating my Sata Drivers. Right now i am getting the same speeds but i am not getting any buffer while watching movies in 4 of my different pcs using Total Media Theater 6 player.
When i use VLC player while watching original Blu ray movies, i get buffer sometimes but it eventually goes after a while as it takes some time for movie to be buffer
I think everything is ok for me.
Thanks a lot for everyone who helped me patiently
Once again thanks a lot