title: Why does Visual Studio install onto multiple drives?
body: <p>I'm installing Visual Studio 2008 onto a new machine (yeah yeah, old-fashioned I know but I want to do it) and the installer seems determined to write data to <em>TWO</em> of the three hard drives attached to my system.  No matter what options I choose, it always tells me that some drive space is needed on C (my main drive) and X (my backup drive).  I only want stuff written to C.  Here's an illustration:</p>
  
  <p><img src="https://i.stack.imgur.com/zyow7.png" alt="Visual Studio 2008 setup"></p>
  
  <p>It always requires some space on my X volume.  Why?  Is there any way to force it to install to just C?  I guess I could physically disconnect all drives other than C, but does anyone know why VS2008 is so determined to write to more than one drive?</p>