Burn .iso image to CD?

I downloaded an iso image of a CDROM, which contains software for a SunOS system, to my iMac. I need to burn this to a CDROM so I can install on the Sun. Burning the XX.iso file makes a CD with this XX.iso file at the top level of the CD, rather than putting the CONTENT of the XX.iso file at the top level, its now one level further down. If I double-click the XX.iso image on the iMac, it mounts and opens, and I could select all files showing and move them to the burn folder and burn, but I am concerned that some information would be lost doing that. Can anyone tell me how to burn a CD directly from the XX.iso file, so I have a duplicate of the CD that the XX.iso file was made from? Thankyou.