Well, u can use slayers auto install to fdi it, but it is 100mb. You can also just use raw commands through evoX:
http://www.xbox-scene.com/articles/hdd-ftp.php
basiaclly, you copy the C and E partitions to your PC via FTP. Then burn evox to a cd/dvd. change hdd's, then load up evox in your xbox. Use the raw commands then copy C and E back to the xbox.