Seagate Barracuda ES 1 TB 7200RPM SATA 3Gb/s 32 MB Cache 3.5 Inch Internal Hard Drive ST31000340NS-Bare Drive The industry's highest-reliability 7200- RPM drive, designed for 24x7 operation Delivers 1 TB capacity, 32 MB Cache; interface option is SATA 3GB/s, 1.5 GB/s Seagate PowerTrim technology dynamically optimizes power consumption by improving GB/watt by 55 percent and by reducing overall drive power consumption by 20 percent over prior-generation Barracuda ES drives.