If you have a copy of Win8 from an old system, it will be a paint to get a DVD.
Windows 7 DVD isos are easy to come by for now(get it only from links that point to digital river as that is the location MS and many other companies store software[a nice untouched copy].).http://www.w7forums.com/threads/official-windows-7-sp1-iso-image-downloads.12325/
You may be able to do this with a Windows 7 install disk as well since junctions are an NTFS feature not a feature of each version of Windows.
I would go as far as to guess it may even work on another system with Win7, but I have not personally tested it like that.
I actually started to use junctions to move games and programs from ssd -> hdd and hdd -> ssd. I also use symlinks to have all my files like documents/desktop/videos/pictures/downloads ect on another system.