I always prefer to use C drive only for OS and D drive for other installations. And I did the same thing when I installed Visual Studio on my machine. I installed it on D drive and when I tried to install newly downloaded LightSwitch from DreamSpark, I found that even the install directory is D, it uses loads of space on C drive as well !!
I just don’t understand the point of having thing on C. But I guess it is typical MSFT. Because I found same behavior when I installed SQL Server or Visual Studio in past. Only difference is this time I remembered to take screenshot of installation 
That’s it for now.
It’s Just A Thought … 
