HEEEEEEEEELP Why isnt my backup of LUNAR 2 working???

[IC_Katana]

I wanted to make a backup of my new PSX game LUNAR 2 but the copy wont work. I cant find any patches / etc. . I used NTI CDMaker (older Version). The
Imagefile is 470 MB, the size of the burned game seems to be 630 (in windows) I tried 4 different CD-R types, burning even at 1-speed, but nothing changed.

The Game itself starts, opening movie ok, but every videosequence after that
get the PSX to hang, searching soundly for data on the CDR.

PS: American NTSC-Version playing at German-NonStealth-BootChip-PSX!