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		BEWARE INFORMATION FOR GALAXY-10-V702

			BEWARE INFORMATION FOR EDIT 430 IN PULSAR

      PULSAR will occasionally fail to correctly  read  labeled  tapes
      written  by versions prior to 4(421).  This is due mainly to the
      unpredictable  behavior   of   earlier   versions   of   PULSAR;
      specifically  their  inability  to  write  HDR  labels and/or to
      position around tape marks correctly while writing these labels.
      Errors  are  reported as usual, to OPR.  The most common will be
      "File sequence errors".  To get around this  problem,  edit  430
      gives the operator three options:

          ABORT:    Abort the request and return positioning error  to
                    the user's program.
          PROCEED:  Try to ignore the  error  and  let  the  tape  I/O
                    happen.   This  is  not  recommended,  as using it
                    could sacrifice data security.  See below.
          RETRY:    Retry  the  search  for  the  sequence  number  in
                    question.

      We suggest that users owning tapes with sequence  errors  should
      rewrite  those tapes with good data.  We will make no attempt to
      automatically allow bad formatted tapes to be processed.  To  do
      so  could  defeat  the  security mechanisms normally afforded by
      labeled tapes.  Do not  SPR  this  behavior  as  a  problem,  as
      version 4(440) will be correctly detecting these errors.
      ************************************************************************



END OF GALAXY-10-V702