Here is a very good explanation of the weak sector problem on CDs:
http://ixbtlabs.com/articles2/magia-chisel/. It is used in some copy protection schemes like SafeDisc. It reminded me of weak data I produced on the C64 where GCR-encoding was done in software. So you could easily write something that is not well formed. Doing this led to sectors that contained different data every time you read them. Very funny. And confused every copy program I know of.
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