Seagate Constellation ES.3 ST1000NM0023 1TB 3.5" 7.2K 7200RPM 128MB Cache SAS 6Gb/s Internal HDD Hard Disk Drive 9ZM273-039.Seagate Model Number: ST1000NM0023Seagate Part Number: 9ZM273-039Lenovo Part Number: 00D5314 11S00D5314IBM Part Number: 42D0777 1P42D0777 49Y1903 1P49Y1903Compatible Part Numbers: 42D0778 42D0781 49Y1939 49Y1930Specifications:ModelModel Number ST1000NM0023Product Line ConstellationProduct Series ES.3PerformanceProduct Type Internal Hard DriveForm Factor 3.5-inchCapacity 1TBCache 128MBSpindle Speed 7200 RPMAverage Seek Time 8.5 msDrive Interface Type SAS 6.0GbpsFeatures- Drive Self Test (DST)- Embedded Servo Design- Dedicated Head Landing Zone- Background Media Scan (BMS)- Perpendicular Magnetic Recording (PMR)