Element_Info

   The element_info_t data structure is defined in the include file
   <mrd_common.h>. The fields of this data structure are described
   below:

   o  name - The name field holds the volume tag of the media if
      applicable.

   o  state - The state field can have one of the following values:

         ELEMENT_FULL,
         ELELMENT_EMPTY, or
         ELEMENT_EXCEPT.

   o  port_type - If the element_type parameter specifies PORT, the
      port_type field will have one of the following values:

         IN_OUT_PORT,
         INPORT,
         OUTPORT.

   o  status - The status field can have one of the following
      values:

         MRD_STATUS_SLOT_INVALID,
         MRD_STATUS_DEVICE_INVALID,
         MRD_STATUS_TRANSPORT_INVALID,
         MRD_STATUS_PORT_INVALID, or
         MRD_STATUS_SUCCESS.

   o  flags - Use the ELEMENT_VALID mask on the flags field to
      indicate whether or not the full Read Element Status data
      is valid. The ELEMENT_PVOLTAG and ELEMENT_AVOLTAG indicate
      whether the primary or alternate volume tags of the Read
      Element Status data are valid.

   o  element_addr - This is the address of the element, unadjusted
      for the starting address. The routine mrd_map_element(3mrd)
      can be used to convert an absolute element address to a
      relative address and type. This field will be set to -1 when
      the information is not valid.

   o  source_addr - On most SCSI-2 medium-changers, this is the
      address where a cartridge resided before being moved to its
      current location. The routine mrd_map_element(3mrd) can be
      used to convert an absolute element address to a relative
      address and type. This field will be set to -1 when the
      information is not valid. On some SCSI-2 medium-changers (the
      DLT family loaders) this will be the element address of the
      slot itself.

   o  data - This a copy of the SCSI-2 Read Element Status data
      when the ELEMENT_VALID bit is set in the flags field. A byte-
      order neutral declaration of this data structure is included
      in the <mrd_common.h> include file as the mrd_reades_t data
      structure.