That sound you hear is Western Digital grabbing hold of an udder and not letting go as it continues to milk the 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).