CD-R Not Recognized byiMac

I have a problem with CD-R discs. I burn data discs using the mac only
setting with Toast 6.1. This is done with a Que Firewire burner on a PowerMac
G4 400mhz running Panther 10.3.9.

My iMac 333mhz tray loading CD drive also running Panther 10.3.2 will not
recognize the disc.

The CD-r is readily recognized by the internal CD drive of the G4.

The iMac CD drive does recognize commercially prepared CDs.

What am I doing wrong? The media is a Sony 700mb CD-R

.

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