Seagate Momentus ST9500423AS - hard drive - 500 GB - SATA-300

Seagate Momentus unlocks the power of notebook computers with a 5400-RPM spin speed and optional 8MB cache buffer. Momentus stands head-to-head with 4200-RPM notebook drives in BatteryMark tests, while simultaneously increasing system level performance by almost 50 percent. Seagate Momentus delivers the experience, commitment and innovation you expect from the world's leading manufacturer of disc drives.