if you use hdloader, you can just use winhiip (i use hdldump, but im sure that winhiip will work also) to transfer the full iso to the hdd. i havent played the game all the way through, but i hear that both layers can be accessed. what are you using to burn the image?
I used winhip to get my hd ready and used dvd decrypter on ghwt and just put the ISO on the hard drive plays all the way both layers.The only prob i got is every now and then it will freeze up but im sure its my hard drive though it is an old seagate 80 gig it has been through many many reformats due to my testing a tons of programs.I love the new mcboot and hdloader good luck.