Western Digital WD5000AAKX Blue 500GB 3.5" 7200 RPM 16MB Cache SATA3 6.0 Gb/s HDD Hard Disk Drive WD5000AAKX-08ANVA0.Model Number: WD5000AAKXWD Part Number: WD5000AAKX-08ANVA0Lenovo Part Number: SH20G63120 8SSH20G63120Lenovo FRU Part Number: 00PC550Specifications:Form Factor: 3.5"Interface: SATA3 6.0 Gb/sCapacity: 500GBCache: 16MBRPM: 7200 RPM