Buffalo's DriveStation Duo USB 3.0 Hard Drive Array is a two hard drive, RAID enabled USB 3.0 storage solution for small servers, creative professionals, offices and consumers who need redundant and high performance external storage. RAID 0 & RAID 1 support offers flexible capacity and redundant configurations or both drives can remain independent of one another. With USB 3.0 support and backward compatibility with USB 2.0, DriveStation Duo USB 3.0 works with almost any PC or Mac computer and provides interface speeds up to 5Gbps. Equipped with NovaBACKUP Business Essentials software, DriveStation Duo USB 3.0 can back up any PC including Windows Servers and Exchange and SQL datastores. Plus, user replaceable hard drives offer easy maintenance with no tools required. Form Factor: 3.5" Interface: USB 3.0 RAID: 0, 1, Normal (Independent Disks) Dimensions: 8.1" x 5" x 3.4" Weight: 4.5 lbs. Features: SuperSpeed USB 3.0 compatibility with USB 2.0 Back up and Manage Your Data with Buffalo Tools! Buffalo's Backup Utility ECO Manager RAMDISK SecureLock Parts: 1 year limited Labor: 1 year limited