On my Win10 machine, I have a 128 GB thumb drive that had not been working correctly all the time. I formatted it (takes forever!) and then used File Explorer to copy some folders from another thumb drive.
SOME folders copied correctly. Others seemed to copy correctly, yet when I "safely Removd" the thumb drive and then plugged it in again, some folders existed but were empty.
In one case, the original folder contained 2 .txt files, but they did not remain on the drive after I removed it.
This has happened on another Win10 computer I have; and it's not always the same folder that won't copy correctly.
Anyone have any ideas about this? I've spent some time Googling, but have not found anything relevant to this situation.