Western Digital gave a more formal debut to its first Thunderbolt-equipped drive at Macworld|iWorld on Thursday. The My Book Thunderbolt Duo uses the fast 10Gbps port to feed two 3.5-inch hard drives at speeds that would be impractical for FireWire 800. On a 6TB Thunderbolt Duo, peak transfer speeds can hit over 250MBps (2Gbps), making the only bottleneck the drives themselves.
