Try directly connecting to the PC (ie: without the hub).
Some external USB drives have issues with hubs, and also with cable length. Some external USB3 drives ship with a rather short cable (for example), and often won't work directly connected if a longer cable is used.
Some external USB drives have issues with hubs, and also with cable length. Some external USB3 drives ship with a rather short cable (for example), and often won't work directly connected if a longer cable is used.