Well RB your Users like Victor says is quite large and I suppose my suggestion re the Partition Wizard app wouldn't be much help if like yo say the drive is not partitioned?

I usually prepare the drive especially SSD's before the install using WHS's tutorial -that make sure that it is aligned see - SSD Alignment

Another little app that will show all is Ultrasearch for example if you want to see all executables type in *,exe in the box and it will list all .exe files.
UltraSearch - Freeware for Ultra-Fast File Search