] Mr Byrnes has studied five cases of DVD rot - four in his
] own collection - and suspects the microscopic corrosion
] spots on the aluminium layer inside the disc could be
] caused by a "chemical attack", possibly related to the
] glue used.
]
] One DVD website lists 18 titles known to have at least
] one bad batch, among them Planet of the Apes (1968), Men
] in Black: Collectors Edition, Independence Day and the
] Alien Legacy box set.

A bad case of DVD rot eats into movie collections - smh.com.au