I bought a bunch of HD DVDs off of eBay--all of which were from Warner Brothers. They suffer from a condition known as laser rot which means that they no longer play. This condition plagues WB HD-DVDs only as far as I know. All of the other HD DVDs I have in my collection work fine with no issues.  This video has examples of the condition and some of the titles which were bad even though they were shrink-wrapped new when I got them

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