I upgraded to a Hopper 3. I purchased a 12TB Western Digital External Hard Drive to accommodate recording of 4K movies. I have been a Dish Subscriber for over 19 years and was aware of the 2TB data limit on previous Hoppers but, did not think that the new Hopper 3 would have the same past limitation as being 4K ready I would have thought it would be able to recognize larger external drives. I talked with Dish's Tech as well as his Field Manager during the install and 2 phone Tech's after my install. I asked the Field Manager at the time of install as well of each of the 2 phone Tech's if they would turn in a request to Engineering or Development to please contact me about whether the problem in the Hopper 3 is format or software driven. The WD 12TB External Hard Drive is a My Book Duo and it is shipped with 2 drives working as one drive unless you configure partitions and is formatted for NTFS. At this time I have not confirmed the details above but I assume WD information is correct. It would seem that the Hopper 3 would recognize the hard drive however, Dish may need to provide a software update to provide the necessary link for compatibility with external hard drives larger than 2TB. The problem with the future of recording 4K movies is a 2TB external hard drives will be seriously limited in the amount of hours of movie recording. I only use the Hopper 3 internal 2TB hard drive to act as a holding area for weekly Tv Series recordings and to hold any movies temporarily to later be transferred to the external hard drive for permanent storage. My current external drive is a 2TB Seagate self powered and has been utilized on 2 previous Dish Receivers 922 & Hopper 1 and has worked on every receiver including the current Hopper 3. I have talked with the WD Tech support however, they feel it is the Hopper 3 that is not recognizing the WD HD most likely because of software or the Hopper 3's format to the external hard drive. If Dish monitors this site I ask please to work on a fix/update to cure this problem and if you do have a resolution currently please post details with your contact information so I can resolve my issue. If any of members has recognized and solved this issue please send me detailed information in how to solve my problem. Thank You to All for your Help!!!