Seagate Savvio 10K.5 900GB 10000 RPM 64MB Cache SAS 6GB/s 2.5" HDD Internal Enterprise Hard Drive ST9900805SS 9TH066-881 STX-ST9900805SS.Seagate Model number: ST9900805SSPart Number: 9TH066-881Compatible Numbers: STX-ST9900805SS