HI, I have experienced that after putting Evo X on the Hard Disc (See my Sticky in XBOX Mod Discussion to be able to install it without linking to a PC) that some games will not load at all off disc!

I have found the Solution

Edit your Menu.ini with the bold link, place it under the root menu :

Section "Root"

Item "Run Game From Drive","d:\default.xbe"
Item "MS Dashboard",@3
Item "Reboot",@5

Section "System Utils"
Item "Network",@6
Item "Harddisk",@7
Item "Flash BIOS",@1

Put the disc in the drive then select.
This may also work to be able to play games from CDR!! I need someone to test.

Thanks guys.