I’ve plugged in my new My Book 3 into my mac book pro. The only things that show up when I open it are 3 folders: extras, locale, user manuals. There is no smartware to install.
How do I install it and where can I download the software (any links?)
Thanks 
Hi there and welcome to the WD community
You can check the download section on the WD support website and download the latest software versions, here is a link to the download section:
http://support.wdc.com/product/download.asp?level1=1&lang=en
You should be able to locate the model of your unit and get the latest software for it.
