USB access from switch

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http://serverfault.com – Currently, I have a network setup that kind of duct-taped together. I have A.) The wireless DSL modem with four ethernet ports and a USB 2.0 port B.) The wireless router with four ethernet ports and a USB 3.0 port C.) The 25 port switch to which all of the computers are connected. The computer hooked to the wireless have a choice of connecting to either the modem or the router. Here is a picture I drew up My goal is to have both the wired and wirelessly connected computer be able to access this external USB 3.0 hard drive. Any suggestions? (HowTos)