Just bought the ultra 4670 with latest firmware, 9.2. Attached WD 4TB hdd to USB port and it instantly recognized the drive and all my audio/video files. I am using Roku Media Player. Unit worked perfectly for 3 days. But, after disconnecting the USB cable to transfer files to my laptop, and reattaching USB cable to the Ultra, it no longer sees the hdd. I get the message "Waiting for media devices". Just to rule out the hdd, I attached it to my laptop and it recognized it, files and all, with no problem. I reset Ultra to factory defaults, uninstalled and reinstalled Roku Media Player with no success. Again, hard drive is perfectly fine on other devices. I'm stumped...Any ideas? Thanks so much! Also, hdd has its own AC power adapter so it's not being powered by the USB port. Edit:. Just attached a thumb drive to USB port on Ultra and it doesn't see it, either. Looks like I have a faulty USB port on the Ultra.
I am having nearly this exact same problem! I'm using the Roku Ultra (4660X2) and a Samsung T5 (1TB, format is NTFS).
I had it working perfectly. I unplugged it from the Roku in order to load more files. When I plugged it back into the Roku it will no longer see the USB drive at all. Nothing I can do will make it see it again. I removed all the files from the drive. Nothing. I formatted it (again to NTFS). Still will not see it. I plug in a Samsung T5 500GB drive and it works just fine. I am stumped and frustrated at how it worked but will no longer work. Both drives work in multiple computers without fail.
Just came into the same issue myself and was hoping to find a fix here. Been using this external hard drive for years with virtually no issues. Maybe something in my hard drive just crapped out? Though it's strange because it works just fine with my laptop.
I have not found a solution. Both of my Samsung T5's work with multiple computers without issue. My 1TB Samsung T5 does not work with the Roku no matter what I do. The 500GB T5 seems to work just fine. It may be time to find a solution that isn't Roku if I can't get this resolved.