code: private String mountPath(CdjStatus.TrackSourceSlot slot) {
          switch (slot) {
              case SD_SLOT: return "/B/";
              case USB_SLOT: return "/C/";
          }
          throw new IllegalArgumentException("Don't know how to NFS mount filesystem for slot " + slot);
      }
docs: Return the filesystem path needed to mount the NFS filesystem associated with a particular media slot.
  
  @param slot the slot whose filesystem is desired
  
  @return the path to use in the NFS mount request to access the files mounted in that slot
  
  @throws IllegalArgumentException if it is a slot that we don't know how to handle