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How to finalize dvd-r on a Mac!?

I have plenty of dvd-r cd's that were never finialized on my camcorder (hitachi). I no longer own that camcorder, I'm no stuck with at least thirty dvd-r's that show as blanks. I know there is a way to finalize them on a computer. I own a mac any suggestions, your help is greatly appreciated!!
rpauls, January 2010