I happen to have 4 Enhanced CDs and a reader that helped me get into their leadouts, where I found special patterns...
Disc A: 45AAD10000000255331852DC
Disc B: 45AAD1000000026721374985
Disc C: 45AAD10000000274015739F6
Disc D: 45AAD10000000274393289C9
The pattern occupies 3 adjacent subcode blocks of every 6, where the rest are regular subcode blocks, just as the figure shows...
does anybody know about this patterns? Thanks beforehand for sharing your knowledge.