Your using this:
http://cdmediaworld.com/hardware/cdr...sc%204%20Hider
Step by step thing:
1.) Run SD4 Hide and press the hide button
2.) Mount the maxi-image
3.) Close out Explorer window that pops up
4.) Run NFS from desktop shortcut
5.) Play game
Optinal 6.) After playing close out NFS and press restore button in SD4Hide.