Seagate Constellation ES ST31000424SS 1TB 3.5" 7.2K 7200RPM 16MB Cache SAS 6GB/s Internal HDD Hard Disk Drive 9JX244-150.Seagate Model Number: ST31000424SSSeagate Part Number: 9JX244-150Dell Part Number: U738K 0U738K TH-0U738KSpecifications:ModelManufacturer SeagateManufacturer Model # ST31000424SSManufacturer Part # 9JX244-150Product Line Constellation ESPerformanceProduct Type Internal Hard DriveForm Factor 3.5-inchCapacity 1 TBCache 16 MBSpindle Speed 7200 RPMAverage Seek Time 8.5 msDrive Interface Type SAS 6.0 GbpsFeatures- Low Halogen Design- Drive Self Test (DST)- Embedded Servo Design- PowerChoice Technology- Background Media Scan (BMS)- Idle Read After Write (IRAW)- Dedicated Head Load/Unload Zone- Perpendicular Recording Technology- Programmable Auto Write and Read Reallocation