HELPLIB.HLB  —  SET  FILE  Qualifiers  /DATA_CHECK
       /DATA_CHECK[=([NO]READ,[NO]WRITE)]

    Specifies whether a read data check (rereading each record), a
    write data check (reading each record after it is written), or a
    combination of the two is performed on the file during transfers.
    By default, a write data check is performed.
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