Optical information storage disk for use with electronic article surveillance systems

An optical information disk of the type comprising a generally planar, generally annular first disk surface and an opposed, generally annular second disk surface oriented generally parallel to said first disk surface, an outer, generally circular peripheral rim extending between said first and second disk surfaces and structure defining a generally centered aperture extending between said first and second disk surfaces and a plurality of generally concentric data tracks optically accessible from at least one of said disk surfaces, wherein said disk is further adapted for use with a magnetic electronic surveillance system to prevent unauthorized removal of said disk from an access restricted location, said disk further comprising a generally annular, magnetic electronic surveillance marker carried about said aperture and means for securing said marker to said disk without impairing the operability of said disk, wherein said disk includes structure defining a groove in said first disk surface including a generally cylindrical groove inner wall oriented generally normal to said first disk surface, an opposed, generally cylindrical groove outer wall oriented generally normal to said first disk surface, and a generally annular bottom wall oriented generally parallel to said first disk surface extending between said inner and outer groove walls and wherein said marker is positioned within said groove.