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.