Parameters

   o  robot_info - This is the address of a robot_info_t structure
      initialized using mrd_startup(3mrd) or mrd_show(3mrd). This
      data structure contains the element starting address and
      counts for each type of element, which are needed to map an
      absolute element to the correct zero relative address and
      type.

   o  lock The lock argument indicates whether media removal should
      be prevented or allowed.

   o  dev_status - The dev_status is the address of a dev_status_
      t structure, which is used to pass back detailed error
      information in the event of a command failure.