Seagate Barracuda 7200 320 GB 7200RPM SATA 3Gb/s 16MB Cache 3.5 Inch Internal Hard Drive ST3320613AS-Bare Drive (Amazon Frustration-Free Packaging) Spindle Speed is 7,200 RPM Delivers 320 GB capacity, 16 MB Cache; interface option is SATA 3 GB/s NCQ Ships with the industry's most reliable and proven perpendicular magnetic recording (PMR) technology