These are the instructions from Roxio
Roxio Knowledge Base Article - ET6000085
Cannot add a session to a CD-R/CD-RW disc
The information in this article applies to: Toast 6 Titanium
On the following Operating Systems: Mac OS X
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Issue
Cannot add a session to a CD-R/CD-RW disc
Cause
Resolution
1. If using Toast 6 v6.0.3 or earlier, then uncheck the "Close Disc" option:
a. Launch Toast 6 Titanium
b. Click on "Recorder"
c. Click on "Recorder Settings..."
d. Select the "Advanced" tab
e. Uncheck the "Close Disc" option
2. If using Toast 6 v6.0.4 or later, then select the "Write Session" option:
a. Launch Toast 6 Titanium
b. Click on "Recorder"
c. Click on "Recorder Settings..."
d. Select the "Advanced" tab
e. Select the "Write Session" option
If the above do not work, you should also consider these additional steps:
1. Contact the drive manufacturer for a firmware update for your recorder
2. Try a different brand and color of CD media
http://www.roxio.com/en/support/kb/t...60000085.jhtml
Let us know what happens and how.