Bad news for all DreamCast friends. There was a rumor that GDs can be copied with PacketCD or CDRWin. That is completly not true. As a friend told me :

"..GD CD has 2 sessions which are seperated with a long space. Into that space there is a logo of Sega visible. You can easily copy the 1st but you cann't even see the 2nd and most important session which holds all data. The 2 sessions are separated with a large visible space. This is made in propose so the laser beam couldn't even accidenlty reach the 2nd session and read it. I test also the PackeCD rumor and didn;t worked either. 2nd session is still unreadble. So for now i assume we cann't copy them.."