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SafeDisc2 is a raw-sector based copyprotection, you won´t need to read subchannel data from SD2 protected games, but if you´ve SecuROM protected games or Playstation cds with Libcrypt you need subchannel data (PQ for SecuROM, PW for Libcrypt, ´cause you´ve to write Libcrypt uncorrected - only possible in DAO-PW mode).
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