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You can (normally) connect disks via the ethernet connection and infact its normally better to to this because it removed the need for the disk to halve its performance to talk to the hub and your device at the same time (basically, if a disk had say a 100mbps wifi connection, the 50mbps would be used getting the data from the hub to the disk and 50mbps from the disk to your device)
The premium disks though (i think its these models) have a separate radio to do the hub to disk 'backhaul' though.
I use three BT mini-disks, each connected by ethernet back to the hub and it works really well and because I don't loose performance on the backhaul, its as fast as the bigger disks and a lot cheaper.