Western Digital WD5000AAKX Caviar Blue 500GB 3.5" 7200 RPM 16MB Cache SATA3 6.0 Gb/s HDD Hard Disk Drive WD5000AAKX-083CA1.Model Number: WD5000AAKXWD Part Number: WD5000AAKX-083CA1Lenovo Part Number: 16200031 11S16200031Lenovo FRU Part Number: 03T7041Compatible Part Number: 0B07159Specifications:Form Factor: 3.5"Interface: SATA3 6.0 Gb/sCapacity: 500GBCache: 16MBRPM: 7200 RPM