BE CAREFUL WHEN BUYING HD DVD'S.THEY ARE NOW DEVELOPING DVD ROT (SEE WIKIPEDIA).NOW, OVER MY COLLECTION OF > 100 WILL EITHER NOT PLAY AT ALL OR HAVE BAD SECTORS.THE AREA(S) THAT EITHER LOOK LIKE THUMBPRINTS OR HAVE SPECKLED AREAS SCATTERED ALL OVER THE READING SIDE. WHEN VIEWED MICROSCOPICALLY THESE ABBERATIONS APPEAR TO BE BETWEEN THE 2 LAYERS.I HAVE ALSO SEEN THIS IDENTICAL PATHOLOGY IN SOME OF MY OLDER BLU-RAYS.JUST A WORD TO THE WISE. I STRONGLY SUSPECT THAT THE LONGEVITY OF BOTH THESE FORMATS IS MUCH LESS THAN WAS ANTICIPATED.STUART BAUMGARD M.D.