Have you reviewed the partion sturctures. The Roku only access the FIRST partion. If you have a EFI partion on the front of your drive the Roku will not see your NTFS partion.
When I could not get my 5TB drive working, I checked with (Windows Disk Management) the format of the Seagate (STHP5000400) 5TB USB 3.0 drive and found it was formatted GPT with a EFI partition and a NTFS partion. I re-architected the disk (MiniTool) deleting both partitions and creating only a single NTFS partion. Copied a folder of mkv files onto the reformatted drive and the Seagate (STHP5000400) 5TB USB 3.0 drive worked fine with the 4800X. It seems the issue was the EFI partion.
It only has one partition. And I do not think you read or understood my former posts.
I stated that it worked fine (as configured) for several months after I installed it. The RokuSucks not optional, forced updates, screwed the pooch and things that worked fine for several months stopped working.
You may also want to read the part about "I owned a Computer Service Company and Built thousands of systems and networks over the last 25-years.
Not only can I spell UEFI, which should be called 'Goofy Uuufy' and EFI / ESP I know what they are and when one need to use the for BIOS / Security Key boot reasons.
I reformat every Hard Disk I buy. I only use EFI where it is need to communicate with UEFI.
In summary: with no read NONE changes to my hardware, external USB Hard Drives that worked for several months, stopped working.
And here is your clue 'it is not a problem with the hard drives'.
Roku Ultra did a cheap date USB port and is not USB 3.0 because some Roku Suite wanted a bigger bonus. Should they pay for USB 3.0 rights and use the now dated but much better USB standard v.3.0 I would guess that the 'so-called' USB power issue would be solved.
It still won't fix the bug in the Roku firmware or software that left thousands of properly working USB Hard Drives being unrecognised by RokuSucksUltra.
I do not use EFI partitions on a NTFS data drive that is not bootable or does not have an external security device that needs a EUFI access part.