AutoCAD 2013/2014 DWG Format

[#1]

This is weird...

I click on My Computer and it is showing a 4th HDD that I didn't know I had. Called 'Local Disc (X'. The only things in there are my 360 profile, a couple drawings, and my template.

Is this something AutoCAD does? Any reason why?

[#2]

New to 2013 because uou signed up for it with the 360 login: here is an older overview http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=17889433&linkID=16831209