This error code is used when an OpenVMS system service, such as
    $ASSIGN or $QIO, fails with a status of SS$_DRVERR. Generally
    SS$_DRVERR indicates a failure in the underlying device and the
    MRD can get the detailed device failure and return the correct
    MRD status code instead.

    This error is also returned when a SCSI Test Unit Ready command
    fails. The cause of the error can be determined by called mrd_
    request_sense(3mrd). This error also occurs as the result of a
    SCSI command failure, when the ASC is set to one of:

    o  0x08 - Logical unit communcation errors.

    o  0x43 - Message error

    o  0x45 - Select or Reselect failure

    o  0x47 - SCSI parity error

    o  0x48 - Initiator detected error message received

    o  0x49 - Invalid message error

    o  0x4A - Command phase error

    o  0x4B - Data phase error

    o  0x4E - Overlapped commands attempted

    o  0x54 - SCSI to host system interface failure