My Book brand for every penny it's worth. Today, the outfit is introducing a new line of dual-drive units that come ready to mirror whatever information you shove on 'em. The RAID-based Mirror Edition drives tout USB 2.0 connectivity, RAID 1/0 support, a fanless design, user serviceable enclosure, a capacity gauge and intelligent drive management features including automatic power-up and Safe Shutdown. The external HDDs arrive in RAID 1 (mirrored) mode -- which creates automatic duplicates of your files in case one drive fails -- but RAID 0 (striped) can be configured during setup. Stack your My Book collection even higher right now for $289.99 (1TB) / $549.99 (2TB).