Western Digital WD5000AAKX Blue 500GB 3.5" 7200 RPM 16MB Cache SATA3 6.0 Gb/s HDD Hard Disk Drive WD5000AAKX-08U6AA0.Model Number: WD5000AAKXWD Part Number: WD5000AAKX-08U6AA0Lenovo Part Number: SH20A38371 8SSH20A38371Lenovo FRU Part Number: 03T7041Compatible Part Numbers: 16-200544Specifications:Form Factor: 3.5"Interface: SATA3 6.0 Gb/sCapacity: 500GBCache: 16MBRPM: 7200 RPM