WD My Book Thunderbolt Duo

The WD My Book Thunderbolt Duo makes a great alternative to USB- or FireWire-based external drives. The drive is relatively affordable, supports RAID configurations, and is easy to service.Performance 

I tested the My Book in two sets of tests. In the first set, it was stacked up against other Thunderbolt drives as well as internal drives, including solid-state drives (SSDs). In the second, it was tested the way any other none-Thunderbolt external storage devices are tested: against the test machine's internal drive. The drive was tested both in RAID 0 and RAID 1 configurations.

The reason for the first set of tests is the fact that Thunderbolt has a ceiling speed of 10Gbps, whereas the fastest internal drive caps at just 6Gbps of the SATA 3 standard. For this reason, it'd make more sense to test a Thunderbolt storage device against the other fastest possible storage solution, which currently is an internal drive, especially SSD, connected directly to a computer's motherboard. I used a 2011 MacBook Pro running OS X Lion, on a SATA 3 (6Gbps) SSD, as the test machine.my book thunderbolt