WD My Book Velociraptor Duo Thunderbolt Drive for $649 – Deal Alert April 9, 2013 By Eric Reagan B&H has the WD My Book Velociraptor Duo for $649 (reg. $799) through April 11. I tested the Velociraptor Duo a couple months back and got read and write speeds around 350MB/s. It’s a seriously fast drive. Check it out here at B&H Photo.