0×80070052 Error when using USB drive on Windows

I couldn’t do anything with a customer’s USB disk, Windows kept spitting out error 0×80070052. Checkdisk showed no errors. Plenty of space left. I played around with it and discovered the error was caused by too many files in the root directory. Seems the girl didn’t even know how to make a folder. I made subdirs and organized most of her most files for her and the error went away.