Seagate Barracuda ES 1 TB 7200RPM SAS 3Gb/s 16 MB Cache 3.5 Inch Internal Hard Drive ST31000640SS-Bare Drive (Amazon Frustration-Free Packaging) Ships in Certified Frustration-Free Packaging The industry's highest-reliability 7200- RPM drive, designed for 24x7 operation Delivers 1 TB capacity, 16 MB Cache; SAS 3 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.