Seagate Barracuda Green 1.5TB 5900RPM SATA 6Gb/s 64MB Cache 3.5 Inch Internal Hard Drive ST1500DL003- Bare Drive Unique 5900-RPM speed delivers the fastest-performance eco friendly drive available Seagate SmartAlign technology allows you to get all the benefits of the new Advanced Format 4K sector standard without any hassleno utilities, no extra steps SATA 6Gb/s interface and 64MB cache maximize performance Low power consumption combined with leadership in the use of environmental compliance materials means you don't have to sacrifice environmental stewardship for performance Cool, quiet operation