The original executable contains a function call that says: "Check drive D: for Volume ID 'NFS_SHIFT'. If found, run game. If not, throw error."
While the demand for a "no CD patch" for Need for Speed: Shift stems from real usability issues with legacy media, users should avoid unofficial cracks due to legal and security risks. The safest, most reliable method to play the game today is to purchase a DRM-free version from GOG.com or a digital copy from an authorized store. need for speed shift no cd patch
Extract the downloaded .zip or .rar file and move the new SHIFT.exe into your game directory. The original executable contains a function call that