You can write protect the files to stop someone from changing them, but I don't know of any hard drive that has this. If there was one, what would stop the person using it from changing the jumper back to allow writing.
Nothing, however considering the application is my personal computer the someone would be me and I promise not to move the jumper!
The problem with write protecting is it inovolves software control and we all know that doesn't work. There is one and only one method that guarantees the drive can't be written to- hardware jumper