Could be a Boo..Boo... on GCW's part but thats highley unlikely.......surely.....
I have seen a game released in the US, for example, can use a different protection than a game released in the Land Of Aus....
Anyways......You've obviously made a perfect 1:1 copy as it plays in your LG CD Rom, so just download the crack / fix & you wont need to worry about your DVD Rom.....
or is there still CD Checks Sixx2....given the crack is only noted as a fixed exe..... ?