Several years after Thunderbolt was first introduced, most of the drives using Apple’s connector are still high-end, pro-level, and desktop-specific devices. Some time ago, Elgato introduced a more portable solution in the Thunderbolt SSD, and nearly two years later, it has returned with a sequel called Thunderbolt Drive+ ($500-$900). The price has jumped significantly from the original model, but so have the performance and capacity of the…