Man, I get the same problem, I have a computer with w10 ver 1803 and w7 in another pc and the hard drive works fines, but when I put it in a w10 2004 gave me the same error. I tried to change user security, but it's totally block to insert a new
user. I really don't know what to do anymore... Thx!!
The first time this happened, I was able to get permissions back by adding every single possible permission to the drives. Not sure which one, or ones, would do the trick, but that's how I eventually got my "access" back.
The 2nd time around changing my drives to RAW format, was a bit scary, but thankfully adding permissions one by one eventually gave me access back. But it happened at a different time than the first while adding permissions in order, so all I can say is
that 10 is just screwing with us.
However, I found a way, for me at least so far, to avoid anymore external drive issues with this garbage OS. Only connect and turn on an external drive when the computer has been booted up and you are logged into your account. Then do what you need to do
with them and then immediately eject and remove the drives. Never let them stay on, connected and idle. I ran into a permissions issues with this. Never run an disk check at boot as they will for sure mess with your drives. I did that twice and got screwed
both times. Run a disk check via old school DOS while logged in only.
You will probably get a message that the drive may still be in use. DO NOT remove them anyway even if the hard drive is not doing anything because windows is randomly doing something and if you disconnect it you're likely to run into another issue like I
did. After a few minutes that message will go away. However, if you feel windows is screwing with your drive, just pull the connection. Better to chance one or a few damaged files, rather than your whole drives and lose nearly every thing like I did. Do not
leave the drives on and connected when shutting down, nor when booting up. I've run into issues every time I did the opposite, especially when I was testing what to do.
I wish you the best and please let us know if you've resolved it.