Bill is building a computer system using an Arduino. Leo says that Arduino's are a fun project. But when he connects his data drive, he can't open any of his data files. Leo says that it could be a permissions issue on the old Windows account. Go into file explorer, right click on a file, select properties, and see what's going on under the security tab. Also check there file permissions. It may not be listed as giving you the right to read or write to that file.