Last week Dish installed my new Hopper with Sling. Prior I was on a Hopper (no sling but with an actual Slingbox attached). I downloaded all of my recorded shows/movies off of the old Hopper onto a 1 terabyte WD external harddrive. When I try and upload from the external harddrive to my Hopper with Sling I get an error message at the end of downloading the first show that "...an error occurred while downloading." The Dish tech said that this is happening because my harddrive is not the type with it's own power source/cord. He recommended that I post here to see if there anyone knows what I can do to remedy this issue and get it to work. Any help would be much appreciated. Thank you.