MicroNet Gforce3 Pro 4TB External Hard Drive: * Capacity: 4TB * Holds over 1,200,000 photos, over 64,000 hours of music, over 4,000 hours of digital video or over 1,800 hours of DVD quality movies * Cache 32MB * PC and Mac compatible * Sturdy aluminum enclosure * Newest generation USB 3.0 interface (backwards compatible with USB 2.0)