Connecting hard drive though router

Ok I will try and explain this the best way I can. On the mac thought the finder I can see the the shared devices on the network. 2 PC 's,router & WdLive hub. On the PC’s I go to my network places and I see iMac the other PC ,router & WdLiv hub. When I connect the hard drive to the router . I can go to the iMac or PC’s double click on the router and it will show the hard drive where my movies are stored . When I go to network share on the WdLive hub I can see the iMac and the PC’s and access the shared folders or the hard drive if it was connected either. As I said earlier I could access the hard drive that way but it would mean I would have to turn on the iMac or the PC’s Which I don’t really what to to do. I was hoping by connecting the hard drive to the router I would be able to go to network share on the WdLive hub select the hard drive and access my movies from there. I can do this on the iMac & PC 's but not on the WdLive hub. Hope this all make sense. Thanks for all your help