PC Jpg Burn - MAC Compatable

Question - I am using a Dell XP Pro using the Dell Image Expert for my Pics. ( I know the app hangs with Outlook, etc ) I 'm trying to burn a CD that will be readable on a Mac OS 9 or 10. I am using the Roxio Easy CD 6 Drag to disc. I do choose the option of ISO for the eject settings. I test the CD on my PC, all OK. The MAC does not recognize the CD at all. MY burner is an HL-DT-ST CD-RW GCE-8481B. This has happened on 2 separate MAC OS. What’s going on?