Bmpnyc--it could be. It's an HP CD writer plus. I don't know enough about how the hardware actually burns the CDs to know if there is a difference. It works well in the Pioneer players I've tried it in. CD-Rs work well in almost all of my CD players. So far no luck on the Sony--the software in the Sony could be the key--but Sony has offered no help in even answering my questions. I will contact the dealer and check for software updates--there weren't any posted on Sony's website.
I also have an HP CD writer Plus (9300 series) that I use to burn the CD-RW's that read and play great in my Sony 9000ES, so maybe the difference IS in our 9000ES's.
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