What is in the three 2TB drives? Would you be willing to share the root dir here? As Matt said, depending on the content of them, it may be more or less easy to do what you want to do.

I don't know, at present, but I'd guess the only drive that may require some more work is the one where "program files" and "users" directories are located, since those are the system directories that are mapped as system variables in the registry. And "windows" and others related to the OS install istelf, which for some reason I am assuming you have in some other drive, but, again, I do not know.

Ok, maybe I should more simply ask you this, to begin with: is your system drive any of those three 2TB drives, or is it a fourth drive?