You can't install any version of Windows on an external drive. However you can partition a hard drive and have one version on say C: and the other on say E:. If you do that, you won't have any trouble accessing one system's files from the other one.
I'm looking to install Windows 7 on an external SSD on my working laptop, to use it in parallel with the pre-installed Windows 8.
The thing I'm afraid of is that I will not be able to easily access my Win 8 files when I am booted with my Win 7 OS.
Was thinking to make the exact same user with same password in windows 7 so that I can access files without permission issues. Will it work or do I have to do something else?
I don't want to use "Take ownership" every time I switch between OSs.