The green drives don't perform as fast as the "black" ones do, but they're excellent for bulk storage of music and videos because even the slowest disk can play back multiple movie and music files simultaneously. They also take less power and produce less heat. I have several of them and find that they work very well.
Thanks for that and also would there be a big difference in speed of a 7200RPM compared to a 5400RPM as the '1TB WD10EAR' is 5400. As in burning DVD's to the drive etc.