My family has two Dish accounts because we have two locations where we watch tv. We have a Hopper with Sling in one location and a DVR 722 in the other. We are consolidating to the location which has the Hopper. We have three external hard drives on the 722, but they do not appear to be compatible with the Hopper. When we try to access those drives on the Hopper, they are recognized, but we get a message that the programming on the hard drive was created on another system and cannot be read by the Hopper. Dish CS says that Hopper and 722 use different formats causing them not to be compatible. Is this true? Other than keeping two systems is there a way to get the 722 external hard drives to be compatible with the Hopper? Thanks in advance for any input.