SINGLE BULK PACK WD Caviar Green 500GB SATA 6 Gb/s, 64MB Cache Power-saving 3.5-inch Internal Desktop Hard Drive. Massive capacity WD Caviar Green SATA drives now deliver up to 3 TBs of storage on a single drive. Reduced power consumption WD has reduced power consumption making it possible for our energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation. Cool and quiet Drives with WD GreenPower technology yield lower operating temperatures for increased reliability and low acoustics for ultra-quiet PCs and external drives.