We're moving soon and I wanted to upgrade to a hopper when we do. Right now we have a 722 with an external hard drive (WD). I was on the phone with Dish awhile back for something else, but I asked the guy if we did upgrade, could we still use our external hard drive (which I have half full of all kinds of stuff I don't want to lose). He said no, it wasn't possible. So I'm asking here cause this is where the smart people are. 
Is it possible?
Thanks in advance!
Juli

Is it possible?
Thanks in advance!
Juli