Disk Configuration

I have a windows 2000 server with C: D: E: F:
F has all the users home directories and some other stuff. It is approaching capacity and all volumes are basic, not dynamic. I have no space that is not part of another volume. It appears i cannot extend this drive using space from a bigger one…like E:, which has plenty. (I think these 2 were confused and switched upon installation of the server.) Am i correct that i cannot extend this drive? Where can i get better info on this topic?