Instead of vertical insertion, the PD-3507HUB-U3A uses parallel insertion to increase the stability from outside force that might cause the damage of the Hard Drive. The PD-3507HUB-U3A is the new released item with 3 x USB 3.0 ports. The SuperSpeed USB HUB expands a single USB port into 3 and allows to connect max. 3 devices to a host system. Furthermore, PD-3507HUB-U3A is USB 3.0. complying with UASP allowing switch the storage driver to a queuing model and maximize bus utilization.