Help with a cd read only Error Please

I am trying to copy a Turbotax PDF file to a CD-R cd. When I drag it over from the desk top or try to save it to the cd or do a save as PDF from Turbo tax I get the error that the CD is read only. I have already saved something on it. I have tried to go into the finder and change it to read-write but i can not do that even after unlocking it. Can anyone help me learn how to make the CD to a writable cd so I can save the PDF file ? thank you very much

Hi, CDs once written to, will be Read only, even CD=RWs, unless you recorded as a Seesion.

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