Problem with running copied discs

Hi there,
I am having a problem with burning a copy of a disc I have for Shenmue. I use a Mac, and the program I use to burn CDI files is LiquidCD.

Anyway, I have my copy in CDI format, and I burn it in LiquidCD. All goes well until I actually run it in my Dreamcast. Instead of playing the game, it goes straight to the "Music CD" screen. When I exit this screen and try to play the game manually, the Dreamcast resets itself.

I've checked to see if my DC is compatible with copied discs, and it is. Can someone help me?

Also, I've thought that the program I'm using may be the problem, so can someone suggest a new one for me to use?

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