Disk Utility not creating Mac bootable CDs

Hi
I have a 2006 Mac Mini with a SuperDrive running Snow Leopard (10.6). I downloaded a Linux ISO and burnt it to a blank CD using Disk Utility (dropped the ISO on the Disk Utility window, then clicked Burn). The CD burnt and verified with no problems but when I restart, holding down the Option key, it does not see the CD and I'm only given the option to boot from the hard drive. Then, when Mac OS X loads it tells me it has detected a blank CD. The same CD works and boots perfectly ok in a Windows machine. The Superdrive itself seems ok as it can boot from a Windows XP CD.
Any ideas why this might be?
Thanks
Neil

Did the Linux disk come as a bootable Windows image?

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