I use a lot of removable hard drive trays on my comps because I'm always checking out a new OS(even if I only install it for a day

)
Once I accidently put a drive tray in a comp to install yet another OS not knowing(or remembering) that it was loaded with an install of Red Hat 7.3 from a different comp with totally different components.It started up and Kudzu started asking if I wanted to change this to that,etc.....until ,in 5 minutes I had RH reconfigured for this new comp.
It was pretty easy.
lynch