etails.
<P>
 
   The underlying DAS architecture, in its segregated form, is:
<P>
 
<PRE>
        File component          Record count
        ==============          ============
 
   +------------------------+
   |      file record       |   ( 1 )
   +------------------------+
   |    reserved records    |   ( variable )
   +------------------------+
   |    comment records     |
   |                        |   ( variable )
   |                        |
   +------------------------+
   | first data direct