I'm trying to connect two USB disks to the router via a USB hub.  I can connect the first one, and all is well, with the router assigning it a drive letter of G.  I can access this from my devices.  When I connect the second one, it takes on the drive letter of G, and the first one is nowhere to be found.  If I have a file browser on my laptop, looking at the files and folders on the first disk, clicking refresh after I connect the second disk loads the browser with the contents of the second disk.  How can I get the router to assign a unique share letter to each volume?