VMS Help  —  RMU72  Optimize  Command Qualifiers, Crc[=Autodin II]
    Crc[=Autodin_II]

    Uses the AUTODIN-II polynomial for the 32-bit cyclic redundancy
    check (CRC) calculation and provides the most reliable end-
    to-end error detection. This is the default for NRZ/PE
    (800/1600 bits/inch) tape drives.

    Typing the Crc qualifier is sufficient to select the Crc=Autodin_
    II option. It is not necessary to type the entire qualifier.
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