The discussion about 8" write enable tabs reminds me of a box of Imation disks that I have here. I was asked to make a few copies for a customer and was absolutely stymied when the target disks kept showing up as write-protected. It turned out that the Imation-provided tabs are made of a translucent red-colored plastic with the appropriate sticky coating. Evidently, the tabs aren't sufficiently opaque for the write-enable optical sensors on my Siemens drives. Replacing the tabs with ordinary foil tabs solved the problem.
--Chuck
