Tell us about yourself!
Well you shouldn't have to FTP anything from one drive to another; they're both partitions on the same Xbox, so you can just copy from one drive to another. What I did was FTP a completely new software package (CoinOPS Massive) from my desktop computer to the F: drive. The E: drive contained CoinOPS LITE, and I just left that where it was although I doubt I'll ever use it again now.
I used Chimp (already installed on my Xbox) to reformat the F: drive, which is where the space ends up. There is no way to 'add' it to the existing E: drive that I was able to find. Thus, I had to move the stuff on my E: drive over to my F: drive. In the end I just ended up putting a larger version of Coinops onto the F: drive than I had on the E: drive.