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Find, download, and install the latest "firmware" for the Sony DVD-writer -- if the unit does not recognize the special "tags" written onto the 1st record of each "blank" dual-layer disk, you need the latest firmware.
First, be sure your DVD burner is capable of burning dual-layered discs-
Second, it may be rather an issue of copy protection on the disc. Have you succesfully copied commercial DVD's in this fashion?
I'm unsure if I'm allowed to mention any software that might assist you in that regard- google is your friend.