Seagate Barracuda ES.2 ST31000640SS 1TB 3.5" 7.2K 7200RPM 16MB Cache SAS 3Gb/s Internal HDD Hard Disk Drive 9EF248-039.Seagate Model Number: ST31000640SSSeagate Part Number: 9EF248-039IBM Part Number: 42D0547 1P42D0547Lenovo Part Number: 41Y8469 11S41Y8469Compatible Part Numbers: 42D0549 42C0280Specifications:ModelBrand SeagateSeries BarraCuda ES.2Model ST31000640SSPerformanceInterface SAS 3Gb/sCapacity 1TBRPM 7200RPMCache 16MBAverage Seek Time 8.5msAverage Write Time 9.5msAverage Latency 4.16msFeatures- 1TB drive delivers 33 percent more capacity than the Barracuda ES drive.- The industry's highest-reliability 7200-RPM drive, designed for 24x7 operation.- Best-in-class rotational vibration tolerance ensures unrivalled performance in high spindle-density applications, and multi-drive firmware maximizes system availability.- 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.- Choose SAS for the seamless Tier 2 enterprise experience, with improved data integrity and a 135 percent average performance boost over SATA. SAS also reduces integration complexity and optimizes system performance for rich media, reference data storage and enterprise backup applications.UsageFor Enterprise StorageDimensionsForm Factor 3.5"Height (maximum) 26.11mmWidth (maximum) 101.60mmLength (maximum) 146.99mm