Seagate 1.5 TB DesktopSATA 6 Gb/s NCQ 64MB Cache 3.5-Inch Internal Bare Drive ST1500DM003 1.5TB 7200 RPM Hard Drive SATA 6Gb/s interface optimizes burst performance Seagate AcuTrac servo technology delivers dependable performance, even with hard drive track widths of only 75 nanometers Seagate OptiCache technology boosts overall performance by as much as 45% over the previous generation. Ships in Certified Frustration-Free Packaging Best Fit Applications include: Desktop or all-in-one PCs, Home server, Direct attached external storage devices (DAS)