The Sony HDD HB is a straightforward portable drive with one Thunderbolt port and one micro USB 3.0 port, with a cable for each included with the drive. On the inside, it houses a low-power standard laptop hard drive that spins at 5400 RPM. The performance ceiling of this hard drive is just around that of USB 3.0( 5Gbps) . Thunderbolt has a ceiling speed of 10Gbps. Which means it’s impossible for the drive to reach the performance cap of Thunderbolt, making the inclusion of the standard largely useless, at least from a performance perspective.
The drive is also compatible with USB 2.0 and the new Thunderbolt 2 and no matter which port you choose to use, you’ll at the very least enjoy a bus-powered experience. A bus-powered drive only needs one cable for both the data and power connections
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Amit yadav