UFDFND.LIT


          FUNCTION:


               To  compile a list of blocks on the disk that could possibly
          be or have been User File Directory (UFD) blocks. This list could
          be useful in rebuilding the directory(s) for an account where the
          file directory system for a device has been lost.


          HINTS/RESTRICTIONS:


               UFDFND may be run from any account on the  system  and  will
          function on any device on the system.


               UFDFND  does  not  require  the bitmap or the file directory
          system to be intact, and is intended as an  aid  to  rebuild  the
          file directory system.


               Although  not  required,  it is recommended that there be no
          other users on the system, or at least no access  of  the  faulty
          device.


               UFDFND will read every block on the device, and is very time
          consuming in the form of disk reads.


               UFDFND  may  return blocks that were not directory blocks if
          the correct bit pattern happens to be in the correct location for
          a directory block.


          FORMAT:


               .UFDFND {device:}{/P}


               The device may be any device that is  currently  mounted  on
          the  system. The driver must be resident in system memory as part
          of the monitor. Multiple digit drive numbers are permitted.


               The /P switch will allow for the output of  a  file  by  the
          name  device.UFD  (ie.  DSK0.UFD).  This will allow for a printed
          copy to work from in  the  rebuilding  of  the  directory(s).  To
          prevent the possible destruction of valid data, it is recommended
          that  the /P option not be used with the default device. The file
          is created in the account  you  are  logged  into  when  you  run
          UFDFND.

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          DEFAULTS:


               If  no  device is specified, then UFDFND will default to the
          device you are currently logged into.


               The /P option is NOT defaulted and must be specified.


          OPERATION:

               1.  Type UFDFND followed by the device you  wish  to  search
                   for possible UFD blocks. Use the /P option if you expect
                   a lengthy list.

               2.  UFDFND  will  return  the block numbers that have any of
                   the extensions listed below in the correct position  and
                   in  RAD50  in  the block for it to be a UFD block. There
                   only has to be one match for the block to be displayed.

               3.  UFDFND will not locate the any MFD blocks.

               4.  The output file produced by the /P option  is  an  ASCII
                   file  and  the  same format as the output to the screen.
                   The file may be printed or VUEd.



          ERRORS:

               A.  ^specification error:


                        Your command line was of incorrect  format.  The  ^
                   indicated the location that UFDFND did not understand.

               B.  All other errors are from the AMOSL operating system.



          CHARACTERISTICS:


               You can use UFDFND to determine a list of possible directory
          blocks  to  be  used in the rebuilding of UFD's. You will have to
          use DSKDDT or other  block  editor  program   to  do  the  actual
          rebuilds. Consult the AMOSL  System Commands Reference Manual for
          help.


               UFDFND  will probably not be needed unless you lose the file
          directory system, then it will become a valuable tool  to  assist
          in  saving  lost  data. The best safeguard is a current backup of
          the data. Do not depend on UFDFND to save all your data!


                                     2
               UFDFND is control C (^C) interruptable, if CTRLC is  SET  on
          the  user's  terminal. The output file will be properly closed if
          the program is ^C interrupted.


          EXAMPLES:


               .UFDFND 
               UFD search commencing on DSK0
               This device contains a total block count of: 29088
               The following blocks appear to be User File Directories:
               13      14      15      17      ..........



               .UFDFND DSK1:/P
               Print option has been initiated - output to DSK1.UFD
               UFD search commencing on DSK1
               This device contains a total block count of: 29088
               The following blocks appear to be User File Directories:
               13      14      15      17      ..........


          EXTENSION LIST:

          .BAK    .BAS    .BV     .CMD    .CMN    .CPY    .DAT
          .DBD    .DBK    .DO     .HLP    .HLV    .IDA    .IDX
          .INI    .LIT    .LIB    .LSP    .LST    .M68    .MNU
          .OBJ    .OLD    .QRY    .R      .REN    .RPT    .RUN
          .S      .SAV    .SBR    .SEQ    .SV     .SYM    .SYS
          .TXT    .UNV    .VUE







                                        UFDFND.LIT was written by:
                                        Quaker State Oil Refining Corp.
                                        Research Center
                                        Oil City, PA  16301 - March 1984














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