Does UE4 / Swarm Require a "D" Drive?

I looked through the TCPview and resource monitor list. I could not find Swarm Agent in the list of running processes even though it was running. I did see a process named “system” using port 8008 and I did not see any processes using port 8009.

In addition, I have tried 4.9 and the 4.11 preview and still get the same problem.