Available Disk Space

Hi,

I need to install a new instance of SQL Server 2012 on one of several dozen Windows 2008 Servers. All of those Windows Servers already have 2008 R2 SQL Servers installed.

But I don't know which one of them has enough disk space available for me to do this new install.

Is there a way to run the following command on all of them just once and get the disk space from all of them? Or is there a better way?  

EXEC master..xp_fixeddrives

Thank you for your help.