Hard drive maker Western Digital today announced that the company has begun shipments of its second-generation Caviar Green 3.5-inch hard drives in capacities of 500GB to 1TB.  What's more, they continue to drive energy efficiency.  The new drives consume 20 percent less power than their predecessors, just 5.4W during drive activity, 2.8W during idle and 0.4W during sleep and standby.

And it looks like the company's GreenPower products have been good for business.  In the twelve first months, Western Digital's green drives have surpassed 10 percent of their 3.5-inch drive shipments and have deemed them their fastest growing segment.

Western Digital's Caviar Green 1TB (WD10EADS) drive with 32MB cache sells for a cool $220.