After the Fall 2017 Creators Update for Windows 10 OneDrive folder can not be accessed using prior Windows versions. This oddity is described at the official site:
If you have installed the Fall 2017 Creators Update for Windows 10 and you sync OneDrive files to an external drive, you may be unable to open your OneDrive files if you move the external drive to a computer running an operating system older than Fall 2017 Creators Update for Windows 10.
The suggested workaround is "Use a computer running the Fall 2017 Creators Update for Windows 10 (or newer) to open the content".
I've successfully reproduced the issue with Windows 7 by plugging in a hard drive with a OneDrive folder, created using Windows 10 earlier. Now, when I'm trying to do something with the directory (delete it, or
cd into it), I get an error:
The file cannot be accessed by the system.
There are no logical errors in the FS according to
chkdsk, also I am the owner of the folder and have all the security privileges. No processes are using the volume. Regardless, I can't do anything with this (and only) folder. What is the blocking mechanism?