Advertisements I have 2 OTAs in which I installed 6TB drives about 18 months ago which I will call OTA A and B. I also have another OTA that was purchased about a year ago in which I installed an 8TB drive that I will call OTA C. A and B are set up as mirror image copies on one another for archiving purposes and since their drives were filling up I purchased 2 more WD 8TB drives. I installed one 8TB drive in A and did a mass transfer from the B to A. When that was finished and verified, I took the 8TB drive out of A and did a sector by sector copy of that drive to the second 8TB drive. I then installed both 8TB drives into both A and B. A booted up in the normal time and displayed all of the shows and worked properly. B took significantly longer than normal to boot up and apparently deleted the directory because no shows showed up in My shows and nothing was in the Recently deleted shows folder. So I installed one of the original 6TB drives in B and the same thing happened again. I reinstalled the second 6TB drive back in A and the now empty 8TB drive back in B and attempted a mass transfer from A to B but nothing happened - nothing copied and nothing showed up in B's to-do-list. I attempted to transfer a single show from A to B as well as from C and several model 3 TIVOs. In each case, although I could see the shows on the other TIVOs, when I attempted to transfer the show, B gave a message saying the show didn't exist on the other TIVOs. I allowed B with the empty 8TB drive to record new shows for about a week and verified they were there and could be played. I then did a Restart on B and everything again disappeared. A and C both work fine with their 8TB drives but B continues to give problems. I called TIVO support and reported the problems I was having with shows disappearing and not transferring and they sent me a replacement TIVO, OTA D. Unfortunately it does the exact same thing as B so I suspect it is a software problem rather than a hardware problem as I first thought. When I reinstalled the original 1TB drive in D, all of my problems disappeared. The only difference I see between A and C which both work and B and D which both fail is the software version. A and C are at 20.7.2 and B and D are at 20.7.4. Has anyone else had any of these problems with larger drives on the newer software versions?