Thunderbolt is an interesting technology. It was introduced last year on Apple computers, and by now the first PC products are available with the new connector that combines PCI-Express and DisplayPort. It lets you connect multiple peripheral devices to your computer and has extremely high transfer rates. Western Digital was one of the first manufacturers to implement Thunderbolt in its products, and the My Book Thunderbolt Duo had two hard drives and two Thunderbolt connectors.
While it was a nice product, the performance was a bit of a letdown. Contrary to what you'd expect, WD did not employ high-speed disks and instead used slower, environmentally-friendly disks. The transfer rates were not really impressive, with 217.6 MB/s for writing and 221.1 MB/s for reading in RAID 0.
WD makes up for this with the new Western Digital My Book Velociraptor Duo. It's a My Book equipped with two very fast 10,000 RPM 1 TB disks, the fastest WD currently has. Combined with Thunderbolt we expect to see some very interesting numbers.