looks good, but a small suggestion... find out whats needed from disk1 after it finished with disk3 & copy that file/folder ( whatever it is ) to disk3 too, then you wont have to go back to disk1. Sometimes the install process will start all over again, when going back to disk1 from disk 3.
Just better to end & finish with disk 3, then to swap back again. Other then that it look great
