Form Factor: 2.5" Interface: USB 2.0 Cache: 8MB Dimensions: 4.75" x 3.04" x 0.61" Weight: 0.51 lbs. Features: Mobile - Compact and lightweight USB 2.0 portable hard drive Rugged - Durable metal enclosure Stylish - Perfect match for the Mac notebooks and laptops (HFS+ format) Secure - Includes 256-bit hardware encryption to keep your files secure Software - Iomega Protection Suite software included (download) with antivirus and backup Package Contents: Helium Portable Hard Drive USB 2.0 cable Quick Start Guide Software (via download)