Creating Xbox 360 Backups in OS X

[freaky]

I have a MacPro with a double layer DVD burner. I've tried using Xbox Backup Creator 2.8 in Windows through Parallels, but Windows is not recognizing my DVD drive.

I've attempted to use Toast Titanium 8, Fast DVD Copy, and Disk Utility, but both are showing the disk only has 5.3 MBs (yes MEGAbytes) of disk space that's utilized with my Grand Theft Auto IV disc. I opened Toast and selected File -> Save as Disc Image, but it only created a file that was 5 MBs.

Can someone tell me how to go about creating the ISO so I can burn it in iBurn360? Any help would be greatly appreciated!