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NAME
    Invalid -- Return with error IOERR_NOCMD.
FUNCTION
    This command causes device driver to reply with an error IOERR_NOCMD
    as defined in <exec/errors.h> indicating the command is not supported.
IO REQUEST
    ios2_Command    - CMD_INVALID.
RESULTS
    ios2_Error      - IOERR_NOCMD.
NOTES
SEE ALSO
BUGS
    Not known to be useful.
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