HGST 7K750-500 HTS727550A9E364 (0J23561) 500GB 7200RPM 16MB Cache SATA 3.0Gb/s 2.5" Internal Notebook Hard Drive - w/1 Year Warranty 500GB Capacity 7200RPM Rotation Speed (High Performance) 16MB Cache Buffer Size SATA 3.0Gb/s 2.5" Laptop Hard Drive 1 Year Warranty