Buffalo's DriveStation Duo External 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. Equipped with two hard drives, DriveStation Duo supports RAID 0 and RAID 1 for 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 works with almost any PC or Mac computer and provides interface speeds up to 5 Gbps. Equipped with NovaBACKUP Business Essentials software, DriveStation Duo 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. DriveStation Duo features the redundancy and performance required for demanding professional and server applications.