Seagate Momentus-C ST500LM012 500GB 2.5" 5400 RPM 8MB Cache SATA2 3GB/s Internal HDD Hard Disk Drive HN-M500MBB/AB4 655-1786H.Seagate Model Number: ST500LM012Samsung Part Number: HN-M500MBB/AB4Apple Part Number: 655-1786HSpecifications:Form Factor: 2.5"Series: Laptop HDDInterface: SATA II, Serial ATA-300 (3.0 GB/s)Cache: 8MBCapacity: 500GBRPM: 5400 RPMHeight: 9.5mm