Nocrc

    Disables end-to-end error detection. This is the default for TA90
    (IBM 3480 class) drives.

                                   NOTE

       The overall effect of the Crc=Autodin_II, Crc=Checksum, and
       Nocrc qualifier defaults is to improve tape reliability so
       that it is equal to that of a disk. If you retain your tapes
       longer than 1 year, the Nocrc default might not be adequate.
       For tapes retained longer than 1 year, use the Crc=Checksum
       qualifier.

       If you retain your tapes longer than 3 years, you should
       always use the Crc=Autodin_II qualifier.

       Tapes retained longer than 5 years could be deteriorating
       and should be copied to fresh media.

       See the Oracle Rdb Guide to Database Maintenance for details
       on using the Crc qualifiers to avoid underrun errors.