When copying a file name that contains a bar character, like "file | name.txt", to a USB drive the following error appears:

Failed to copy "/home/podderka/dump/file | name.txt" to "/media/disk/docs/file | name.txt".
Failed to open "/media/disk/docs/file | name.txt" for writing (Invalid argument).
Do you want to skip it?

I assume the reason is because the bar acts as a pipe.

To reproduce error:
1. Create file on hard disk with the name containing '|' (without the quotes).
2. Copy file to USB drive.