Yesterday I discovered what may be a virus on my thumb drive. Or it could just be corrupted files, but I don't know which.
Why do I think its a virus? Because:
1) Whenever I mess with them (e. g. Attempting to copy or move them [which fails] or
going in to the folder) causes my thumb drive to go into read-only mode.
2) Their combined file size is over 1 terabyte, although my thumb drive only holds 16 GB
3) Their are hidden folders that I can only see on Windows

I found them in the files folder of a web page (two actually) that I saved to my computer.
I could probably delete them, but I would like to save them for further study (but not on the thumb drive that has my backups on it).

This virus(?) does not appear to be affecting Ubuntu.