Seagate Momentus 5400.6 ST9320325ASG 320GB 2.5" 5400 RPM 8MB Cache SATA2 3GB/s Internal HDD Hard Disk Drive 9KAG33-043 655-1571C.Model Name: Momentus 5400.6Seagate Model Number: ST9320325ASGSeagate Part Number: 9KAG33-043Apple Part Number: 655-1571CSpecifications:Form Factor: 2.5"Series: Laptop HDDInterface: SATA II, Serial ATA-300 (3.0 GB/s)Cache: 8MBCapacity: 320GBRPM: 5400 RPMHeight: 9.5mm