[opensuse] USB stick is not writeable after playing content on smart TV

Hi all, My problem is shown in the subject. I just wanted to try whether our not too young, not too smart TV can play mkv files. So I copied two videos  on a  8G FAT 32 USB stick. The TV could play both files, with sound. I waned to add some more files from my laptop, but the drive is not writeable any more. Not as superuser. I see the content and can play the two video files on the laptop. I noticed that a new directory, called DVR was created. What can I do besides reformatting? Thanks, Albert