CCSDYDNM000200NSSD0019SMRK0001

        Text_Describing_Optical_Volume_Index.txt

                    June 1990, W.K. Peterson


The Optical_Volume_Index.LIS file contains two tables which facilitate
conversions from a given logical volume identifier (e.g.DEA6_0001A)
to a range of EICS tape numbers, and from an EICS tape number to the
corresponding logical volume number.  Examples of the two tables 
follow (example below is not real data for actual use ) :


               Indexes to EICS optical   Volumes:


                                                                               
 The first table gives the range of  TAPE NUMBERS  of the tapes from the       
 tape based EICS Stand Alone Telemetry File system that are archived on        
 this and previous optical volumes.  The second table gives a tape by tape     
 listing of the optical volume on which the EICS_SATF (Energetic Ion           
 Composition Spectrometer Stand Alone Telemetry File) is written.




                                                                               
 TABLE1:   TAPE NUMBERS OF EICS SATF ON THIS AND PREVIOUS VOLUMES:

                                                                               
    LOG_VOL_IDENT:    Range of tape      numbers

                                                                               
 DEA6_0001A                   1        51  
 DEA6_0001B                  52       103  
 DEA6_0002A                 104       151  
 DEA6_0002B                 152       203

                                                                               
 TABLE2:   OPTICAL VOLUME ASSOCIATED WITH EICS_SATF TAPES

                                                                               
  TAPE NUMBER  OPTICAL VOLUME                                   
          1     DEA6_0001A    
          2     DEA6_0001A    
          3     DEA6_0001A 
          .      .      .
          .      .      .
          .      .      .   
        203     DEA6_0002B    
------END-----                                                                 


The FORTRAN FORMATS USED TO WRITE OPTICAL_VOLUME_INDEX.LIS file are
                                                         as follows :

The first(i) and second(i) arrays contain the self documenting
text as shown in the example above. 


		write	table 1 header
	do i=1,13
	write(66,20),first(i),second(i)
   20 format(a41,a38)
	enddo   
c		write table 1 body

	do i=1,number_of_optical_volumes
	write(66,21), volume_id(i),initial_tape(i),final_tape(i)
   21 format(1x,A20,2i10)
	enddo

c		write table 2 header
	do i=14,17
	write(66,20),first(i),second(i)
	enddo   
c		write table 2 body

	do i=1,number_of_optical_volumes
	 do j=initial_tape(i),final_tape(i)
	  write(66,30),j, Volume_id(i)
   30 format(1x,i10,5x,a20)
	 enddo
	enddo
c			write ---end---
	write(66,20),first(18),second(18)



        Other documentation about Optical_Volume_Index.LIS :

	In the VOLDESC file the reference is in a section beginning with the 
words:  "A second index file..."
	In the file TEXT_DESCRIBING_THE_EICS_SATF_SYSTEM.TXT the 
reference is in a section beginning with the words:
	"An index file OPTICAL_DEVICE:[EICS]EICSDATA.LIS is an index..."

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