I would favour installing the old drive as a secondary because it's quick. But be sure to create a folder on the new drive called something like old stuff and transfer the old stuff into that.
If you don't fancy dismantling -- a network connection is complex if you haven't done it before but relatively quick.
In any case I think Windows has anticipated the scenario and provided a facility in Windows for just that.
Hi I was wondering if you could help me out here! I have two towers and would like to take my old hard drive in install it into my other tower! however im not sure what steps to take ! could you please help me out?