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by rasz 1675 days ago
There is no angle position sensor on the CD, and only one continuous track. This could work if you burned multisession CD, scratched at some specific radius of the first session, followed by coding that information into executable burned in the second session.

https://scarybeastsecurity.blogspot.com/2020/06/weak-bits-fl...

http://dmweb.free.fr/?q=node/210

http://dmweb.free.fr/?q=node/1429

https://scarybeastsecurity.blogspot.com/2020/07/turning-400-...

This one describes very similar floppy protection - encoding physical disk parameters in the executable per every individual disk. https://scarybeastsecurity.blogspot.com/2020/12/the-cleveres...