Hello, if you connect the My Book to most Windows PCs you should get the autoplay window with shortcuts to some options, if you want to disable this, from the My Computer/Computer window, right click on the My Book and select properties, from the autoplay tab you can disable this option. Any other thing that could happen when you connect the My Book will be related to a program that you install or setup on your computer to use the My Book.
You might want to check the link below so you can review the steps on how to manually copy files to an external hard drive.