WD Green hard drives are designed for use in systems that require cool and quiet operation, as secondary drives in PCs, for external enclosures and other applications for which low noise and low heat are beneficial. They provide high capacity storage while using less power than traditional drives. In addition, these hard drives are quieter and cooler than traditional 7200 RPM drives. These earth-friendly 3.5-inch hard drives are ideal for use whenever energy efficiency is needed.
Western Digital WD20EZRX - Green 2TB SATA 6 Gb/s 64MB 3.5 inch Hard Drive (Internal)