Pio2001

The point of CRCs is to completely change as soon as one bit is modified. There is no CRC "more equal than another". It must mean "the more CRC are equal". But if it is an offset problem, the CRC are equal if and only if the offsets are corrected, exept the first/last ones, one of which being possibly different if the overread is not working properly. Again, it matches or not, and it is not related to the drive quality, "unless physical harm is done to the disc".

In CDS200 CDs, CRC, even offset corrected, are different from a drive to another, because there are intentional uncorrectable C2 errors, and different chips handle them differently : uncorrectable for one drive is not necessarily uncorrectable for another, thus possibly different consistent readings on different drives, thus possibly different consistent CRCs for each drive, as Tigre gets for all other tracks.

The errors in the last track can be an average pressing quality, pushed into the uncorrectable domain by the error correction codes being destroyed by CDS200.

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Pio2001