Earlier this month, Western Digital announced an addition to their GreenPower line of energy efficient hard drives, bringing them to the enterprise. Now, they are announcing that the drives are ready to go and have begun shipping all around the world, with the Caviar GP 500GB units consuming a mere 6W when under load.
The new GP units are the same as the existing 1TB units, so there is not a lot to say about them. They are now in retail for an MSRP of $150, making them within the reach of anyone who might want "enterprise" class performance out of a drive that uses very little power. You can read the full press release at Western Digital's site.