Keeping up with its product roadmaps, Western Digital rolled out WD Green 4 TB hard drive (model: WD40EZRX). Designed for personal desktops that need energy-efficient, high-capacity storage, the drive offers 4000 GB of unformatted space, which should yield about 3.6 TB under a Windows NTFS file-system. Built in the 3.5-inch form-factor, the drive features SATA 6 Gb/s interface, variable sub-6,000 RPM spindle-speeds, 64 MB cache, and acoustics management. When spinning and idling, the drive is designed to draw about 3.3W, which goes up to 4.5W under stress, and just 0.4W, when the drive is parked and spun-down. Available now, the WD Green 4 TB is priced between $170 and $190, depending on what package you choose.