Seagate Momentus 7200.4 ST9320423AS 320GB 2.5" 7200 RPM 16MB Cache SATA2 3GB/s Internal HDD Hard Disk Drive 9HV14E-020 515659-001.Model Name: Momentus 7200.4Seagate Model Number: ST9320423ASSeagate Part Number: 9HV14E-020HP Part Number: 515659-001Specifications:Form Factor: 2.5"Series: Laptop HDDInterface: SATA II, Serial ATA-300 (3.0 GB/s)Cache: 16MBCapacity: 320GBRPM: 7200 RPMHeight: 9.5mm