Toast unable to unmount disk..

When using Toast version 5.2.1 or 6, I get an error when using Disk Copy to duplicate a CD or DVD.
The error reads,
"Disk" could not be unmounted.
All open files and programs an this volume must be
closed first.
This is with 15" PB using 10.4.3.
Are these versions of Toast compatible with Tiger?

Yeah....The version I'm running now is Toast 7.0.2 so I think you need to update.
Cheers

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