I own a 622 that that I bought off E-bay and has been working fine for many years. I use a external fan on the side and a power conditioner which really helps extend the IRD life I think. But HD being what they are, have a finite life and mine just passed on to where ever old HD go. Since I have to replace it, I might as well upgrade to a 1TB drive which I read somewhere I can do, but have never replaced a HD in a Dish receiver before. Sooooo my question is can I upgrade to a 1 TB drive and if so is there a particular brand or model number that I must buy? Does the IRD recognize any HD? Also when I replace it is there anything special I have to do to make it work? It appears to be a standard computer SATA drive. Any help appreciated.