In the first embodiment, the barrier layer covers the surface and the outer and inner peripheral end edge surfaces of the recording layer, the inner and outer peripheral portions of the substrate and the cover layer adheres to each other in {HEAD ~ at least partial region} thereof via {TAIL ~ the adhesive layer}, and the maximum length of this region in the radial direction is 0.4 mm or more 
via
In the first embodiment , the barrier layer covers the surface and the outer and inner peripheral end edge surfaces of the recording layer , the inner and outer peripheral portions of the substrate and the cover layer adheres to each other in { HEAD ~ at least partial region } thereof via { TAIL ~ the adhesive layer } , and the maximum length of this region in the radial direction is 0.4 mm or more
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