Connect them thru a hub and only have one powered up at a time.
downriver said:I tried a hub a while back......years ago....to power a USB fan and manage the EHD.....did not work....maybe the wrong version?
Is Dish okay with that?
Technically, only one can be powered up at a time. You could have 3 EHDs connected to a hub (I use powered), and the hub to the receiver. Then only one EHD can be powered up, and it'll work. But this is getting fancy. Easier to just put them side by side and swap cables. That's what I did for a long time.