Another way to get around this is to do your work using SUBSTituted drives. Instead of using the physical drive letter, use a SUBST-d one. E.g.,
T:\: => H:\MyStuff\Temp
V:\: => I:\MyStuff\Core
W:\: => I:\MyStuff\Work
X:\: => H:\MyStuff\External
Here, the work is split over 2 HDs using 4 different SUBST drives. You could plug H and I into a different machine, or copy them to different HDs and plug those into a different machine, etc. As long as you reSUBST T:, V:, W:, X: properly on the new machine, Vegas will find all your files.