Question:

I have two DVD player/recorders.  Both MAC and PC are only seeing  one.  How do I fix it so they see both.

Thanks

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Do you mean you have stand alone burners?  I would question the age of the unit not being detected.  I would look at if it connects via firewire or usb.  I would look at how it's being used on the computer.  You you trying to burn a disc with iTunes using the burner or just watch a DVD.  I guess I would need more information before I could assist you.