I currently have a Western Digital MyWorld II in use for backing up the computers on our network and to have a shared folder on. I have discovered that anybody that connects to our ethernet ports can then see that hard drive and obviously do whatever they want on it. Is there any way to secure the folders on the hard drive so that only the people we want to have access to it will have access? I'm open to suggestions on various ways of doing it. All of our computers are running Windows and most of them are Windows 7.