Well, it is quite large! Have you recovered them yet? I met up with similar conditions before and I retrieve all my formatted data by using a free data recovery software. It is designed to recover lost data due to deletion, format, virus infection and many other unknown reasons. The operation is quite simple. But as the capacity of your formatted data are quite large, it may takes certain time to recover.
You can get more information and download the freeware on this page: http://freeware-recovery.blogspot.
[...] overy.html Hope this may help you.