--------------------------------------------------------------------

              Instructions for creation of a dual format CDrom
                              (ODS-2/ISO-9660)

    --------------------------------------------------------------------

Detailed here are instuctions for the creation of a dual format CDrom which
can be mounted on VMS systems as a native ODS-2 file system and on machines
which recognize and mount ISO-9660 CDs -- This includes VMS!

These instructions assume the use of the following software components:

             + LD062 (available on the OpenVMS Freeware Cdrom V4.0)
             + MKISOFS (available via an internet accessible web site)

This also assumes that a VAX or an Alpha machine will be used. The machine
*must* have one free disk with a capacity not less than 1GB.

Using the software and hardware assumptions listed above, the CD containter
file which is created can be checked prior to writing the final CD.
Therefore, the integrity can be checked prior to creating a "coaster".

       1. Initialize the 'free disk' (heretofore known as FREE$DISK:) using
          the command:

                 $ INITIALIZE/INDEX=BEGIN FREE$DISK:

          This will insure that the disk is initialized such that the
          maximum amount of contiguous free space is available.

       2. Start LD V6.2 if it has not already been started.

                 $ @SYS$STARTUP:LD$STARTUP

       3. Create the CD container file. The 'size' in the following command
          can be used to create the maximum 650MB CDrom. A smaller size can
          be used but it is not recommended by the author of this
          procedure.

                 $ LD CREATE /SIZE=1269528 FREE$DISK:[000000]STAGING.DSK

       4. Create a directory to house the ISO-9660 directory tree and
          files.

                 $ CREATE/DIRECTORY  FREE$DISK:[ISO9660]

       5. Populate FREE$DISK:[ISO9660] with sub-directories and files.

       6. Place .MKISOFSRC file in FREE$DISK:[000000] and edit its content
          to reflect the information you wish to have known about this
          ISO-9600 file system.

       7. Create the ISO-9660 file system container file.

                 $ SET DEFAULT FREE$DISK:[000000]
                 $ MKISOFS -O ISO9660.DSK FREE$DISK:[ISO9660]

       8. Obtain the size of the ISO9660.DSK file.

                 $ DIRECTORY/SIZE=ALL FREE$DISK:[000000]ISO9660.DSK

       9. Compute ISO9660.DSK file size in 2048 block sectors.

                $ ISO9660_SIZE = ({allocation size of ISO9660.DSK}/4+1)*4
                $ SHOW SYMBOL ISO9660_SIZE

      10. Modify the attributes of ISO9660.DSK to have 512 byte records so
          that it may be copied.
          (See step #11)

              $ SET FILE/ATTRIBUTES=(LRL:512) FREE$DISK:[000000]ISO9660.DSK

      11. Copy the ISO9660.DSK file to the STAGING.DSK file, overlaying its
          contents!

                 $ COPY/OVERLAY FREE$DISK:[000000]ISO9660.DSK -
                                FREE$DISK:[000000]STAGING.DSK
                 $ SET FILE/END FREE$DISK:[000000]STAGING.DSK

      12. Connect an LD device to the staging disk container file.

                 $ LD CONNECT FREE$DISK:[000000]STAGING.DSK LDA1:

      13. Initialize the LD device. Initialization qualifiers are used to
          keep the INDEXF.SYS and associated volume files from over-writing
          the overlayed ISO-9660 file system.

              $ INITIALIZE /INDEX=END /HOMEBLOCKS=CONTIGUOUS LDA1 "{ODS-2 label}" -
                          /BADBLOCKS=(64:{ISO9660-size}) /MAXIMUM_FILES=128000

                ISO9660-size= (({allocation size of ISO9660.DSK}/4+1)*4) - 64

The device is now setup for dual format mounting. Check the ISO-9660 file
system with the following commands:

                $ LD CONNECT STAGING.DSK LDA1:
                $ MOUNT/MEDIA_FORMAT=CDROM LDA1: "{iso9660 volume label}"
                $ DIRECTORY LDA1:[000000...]

You may now populate the volume with the files such that the device can be
mounted as an ODS-2 file system.

                 $ DISMOUNT LDA1
                 $ MOUNT/SYSTEM LDA1: "{ODS-2 volume label}"

Copy or backup your files to LDA1:

When you have completed the population of the staging device, dismount it.

The STAGING.DSK file can now be written to the CD/R or CD/RW.

The author of this page uses CDRECORD.

This page has been accessed 97 times.

Copyright © 1998
TMESIS SOFTWARE
All Rights Reserved.                       page design, graphics and layout
                                                                       by
This document was last modified                           [TMESIS Software]
Thursday, April 01, 1999 04:51:38 PM