Though closed with ISO 9660, still can't read on iMac.

I have had the exact same problem, the disc which titled itself on my mac as UDFREADER still cannot be read to date. I have had a team of people working solidly for 3 days trying to figure out to problem with no success, if anyone does find out, please tell us!!!!!

Roxio EZ CD Creator is a fairly simple piece of software that allows for the creation of CD's with relative ease, I use it at work to burn CD's to bring home to my Mac.
I has one particular fault, in my opinion, in that it can allow a CD inserted into the PC to be formatted and treated as a mapped drive. Files are then just dragged onto the mapped drive and they get burned. This method is not recommended as it requires that anyone else wanting to read that CD, have a copy of EZ CD Creator.
Instead choose Make a Data disk, drag your pictures to the bottom right hand window, set the preferences to finalize the disk and then burn it. On completion, eject the disk and you should NOT receive any message about the compatibility of the disk in other CD players.
This disk can be read by a Mac. Do not choose any "fancy" ISO options in the Prefs of EZ, just finalize so that no further burning is allowed. Finalizing the disk afterward does not always work correctly.
If you have already been doing this, I apologize for teaching you to suck eggs and, in that case, I have no idea why your disks do not mount on a Mac.

Let us know what happened

P