your running 2 drives on raid )0( or )1( i have my raid as o but it wasnt a great choice,i was after the high trasfer rate
i have basicly everything on my main raid C drive
with all my expantions and other plugins on the D drive
with a path pionting into your D drive cakewalk
there are many ways you can go, i think iv installed sonar over years every screw up way possible
keep it simple
here is a nice read on plugin scaning, that help know what what at startup.
with a raid 0 i dont even see how fast they load , it helps to keep it down to a few paths
http://blog.cakewalk.com/why-you-should-use-scan-vst-plug-ins-on-startup-in-sonar-x1-really/