o  dev_status The dev_status is the address of a dev_status_t
       structure. The fields in this structure are examined to map a
       SCSI error to an MRD_STATUS code.

    o  os_status The os_status is an operating system specific
       failure code that is used to find the matching MRD_STATUS
       code.

    o  log_info The log_info is a character array that should be at
       least MRD_MAX_LOG_STRING in length. On returning, it contains
       the operating system status.