Burning with CD-RW ...

i recently bought some CD-RW so in my mind i can save some money and instead of buying a 50 back and just burn new cds every week, i can buy 5 CD-RWs and just rewrite over and over until the cd goes bad.
SMART PLAN RIGHT?
wellllll after i burned the first time(went good), when i came back to burn over it to create a new cd itunes says it needs a blank cd to write on.

DOES ANYONE KNOW HOW TO MAKE ITUNES WRITE OVER A CD... which is allowed to be written over(CD-RW)
if there is no answer or solution where can i email itunes producers to ask them to add it to a future update.

THANKS
Greg

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Orignal From: Burning with CD-RW ...