One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
-- JRRT
M.C. Escher - Reptilien
From what I can gather, it uses an enhanced version of the PlexEraser technology found on the PX-760A. It writes over the leadin and data sectors, making the disc unreadable. I'm not sure how much of the data it actually writes over though considering it takes only 3 minutes to do a single layer DVD or CD.