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The GreenPower family includes a hat-trick of power-saving technologies that the company claims will save users as much as $10 per drive per year.

The first of these is called Intelliseek. "This is optimising the movement of the head. It's not seeking as fast as possible, it's seeking just in time," says Daniel Mauerhofer, Western Digital's Senior Manager of Public Relations. "It's a smooth movement and uses less power, but it's always there for the data when it has to be."

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second power saver is called IntelliPower, which strikes a balance between spin-speed, transfer rate and cache "to get optimal performance while maintaining low power," according to Mauerhofer. This means the disk usually spins at less than full pelt. "It's spinning closer to 5,4000 than 7,200[rpm]," he adds.

Finally, IntelliPark automatically unloads the heads while the disk is idle, to reduce aerodynamic drag.

Mauerhofer admits that companies rather than individuals will benefit most from the power savings. "For a single user this may not look like a lot," he says. "But when you're an IT manager with thousands of disks around Europe, that makes a big difference."

He also insists that performance isn't overly compromised, claiming it offers 98% of the performance of a 750GB drive from rival Seagate.

The GreenPower technology will ship in drives ranging from 320GB to 1TB, and will make its debut in the WD Caviar GP 1TB SATA drive at the end of the month.