c&c tiberian sun - unable to detect cd rom drive
 

I have made a backup of C&C Tiberian Sun using nero v4.0.8.3 in LG CED 8083B drive. I copied files from original to hard drive used the unsafedisc v1.5.5 to create new game.exe file and burnt to new cd usining cd-label TS2. when I tried to play the copied game I recieved message 'Tiberian Sun unable to detect cd rom drive. What have I done wrong?