After bumping its Caviar RE2 hard drive series up to 750GB last week, Western Digital has struck again, this time with a line of power-efficient hard drives that features capacities up to 1TB. WD's new GreenPower hard drive family will offer capacities of 320GB to 1TB, and the company boasts that it can cut power consumption by up to 40%. The drives have a variable spindle speed of 5400RPM to 7200RPM, 16MB of cache, and support for 300MB/s Serial ATA transfer speeds. Western Digital cites the following features as responsible for their low-power label:

IntelliPower - A fine-tuned balance of spin speed, transfer rate and cache size designed to deliver both significant power savings and solid performance.
IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise and vibration.
IntelliPark - Delivers lower power consumption by automatically unloading the heads during idle to reduce aerodynamic drag.

The WD Caviar GP 1TB hard drive will first ship in July in the My Book range of storage appliances, with 1TB desktop channel shipments following in August 2007. GreenPower versions of WD RAID Edition (RE) enterprise drives and WD AV consumer electronics drives will ship in volume within calendar Q3.