For more clarity, I'm mostly talking about forza 4. Apparently Infinite Undiscovery worked. I loaded disk two, and then loaded my disk 1 save, and the game instantly switched over. Forza 4 did not. Here is my multi.ini
[454108DF]
; dead space 2
disk1 = Usb0:\Games\Dead Space 2\Disc1\default.xex
disk2 = Usb0:\Games\Dead Space 2\Disc2\default.xex
[535107E4]
; final fantasy XIII
;disk1 = Usb0:\Games\Final Fantasy XIII\Disk1\default.xex
;disk2 = Usb0:\Games\Final Fantasy XIII\Disk2\default.xex
;disk3 = Usb0:\Games\Final Fantasy XIII\Disk3\default.xex
[535107DB]
; infinite undiscovery
;disk1 = Usb0:\Games\Infinite Undiscovery\Disk1\default.xex
;disk2 = Usb0:\Games\Infinite Undiscovery\Disk2\default.xex
[4D5307FA]
; lost odyssey
;disk1 = Usb0:\Games\Lost Odyssey\Disk1\default.xex
;disk2 = Usb0:\Games\Lost Odyssey\Disk2\default.xex
;disk3 = Usb0:\Games\Lost Odyssey\Disk3\default.xex
;disk4 = Usb0:\Games\Lost Odyssey\Disk4\default.xex
[454108CE]
; mass effect 2
;disk1 = Usb0:\Games\Mass Effect 2\Disk1\default.xex
;disk2 = Usb0:\Games\Mass Effect 2\Disk2\default.xex
[535107DD]
; star ocean: the last hope
;disk1 = Usb0:\Games\Star Ocean: The Last Hope\Disk1\default.xex
;disk2 = Usb0:\Games\Star Ocean: The Last Hope\Disk2\default.xex
;disk3 = Usb0:\Games\Star Ocean: The Last Hope\Disk3\default.xex
[535107DA]
; the last remnant
;disk1 = Usb0:\Games\The Last Remnant\Disk1\default.xex
;disk2 = Usb0:\Games\The Last Remnant\Disk2\default.xex
[45410950]
; battlefield 3
;disk1 = Usb0:\Games\Battlefield 3\Disk1\default.xex
;disk2 = Usb0:\Games\Battlefield 3\Disk2\default.xex
[425307EC]
; rage
;disk1 = Usb0:\Games\Rage\Disk1\default.xex
;disk2 = Usb0:\Games\Rage\Disk2\default.xex
;disk3 = Usb0:\Games\Rage\Disk3\default.xex
[4d53084d]
; forza motorsport 3
;disk1 = Usb0:\Games\Forza Motorsport 3\Disk1\default.xex
;disk2 = Usb0:\Games\Forza Motorsport 3\Disk2\default.xex
[4D538861]
; forza motorsport 3
;disk1 = Usb0:\Games\Forza Motorsport 3\Disk1\default.xex
;disk2 = Usb0:\Games\Forza Motorsport 3\Disk2\default.xex
[4d530910]
; forza motorsport 4
;disk1 = Usb0:\Games\Forza Motorsport 4\Disk1\default.xex
;disk2 = Usb0:\Games\Forza Motorsport 4\Disk2\default.xex
[4D5389F0]
; forza motorsport 4
;disk1 = Usb0:\Games\Forza Motorsport 4\Disk1\default.xex
;disk2 = Usb0:\Games\Forza Motorsport 4\Disk2\default.xex