# @(#)README.graft_dirs 1.1 00/01/12 joerg # This is from "Eduardo M. A. M. Mendes" <mendes@mgconecta.com.br> Creating multi-session CD's with dir=/ feature Micro Howto This mini-howto was written as guide to help me to create multi-session CD's with the possibility of determining the location of files. I hope that this guide helps you too. In order to use cdrecord it is first necessary to define to which scsi bus the cd-writer is connected. In my case the setup is dev=0,3,0. It is also interesting to have a separate directory in which all image files can be dumped: /home/cdsource is the directory I chose for dumping the images. The best way to understand how to create multi-session cds is to read README.multi. Most of what is going to be said here is based on that README file and on the help of several cdrecord users. This Micro Howto is divided into two parts as follows: Example a) A dir/=/dir1/dir2 example Example b) A dir1/dir2/=/dir3/dir4 and dir1/dir2a=/dir5/dir6 example We are now ready to start. Example a) An dir/=/dir1/dir2 example A simple example will demonstrate that we can create multi-session cds with the dir_feature of the type dir/=/dir1/dir2 Objetive: Saving root directories of Redhat 6.1 and Col 2.3 on a single CD. Observation: Redhat installation is mounted on COL 2.3 at /mnt/redhat First image - RedHat 6.1 - /mnt/redhat/root mkisofs -D -l -r -f -m core -L -o image1.raw redhat/=/mnt/redhat/root This will create a redhat directory on the cd. The option -D should be used with care. The other options used in the above command are just to demonstrate the use of mkisofs. Please refer to man mkisofs if you want to know more. To see if the image is created as expected, we need to mount image1.raw using the option -o loop (Linux only! for information on Solaris read README.verify) as follows: mount -t iso9660 image1.raw /mnt/image -o loop To see the contents type: ls -l /mnt/image/redhat Does it look ok? Great! Unmount /mnt/image. Now the burning process itself: cdrecord -v -dev=0,3,0 -multi -eject image1.raw To check the burned image we need to mount the cd; something like mount -t iso9660 /dev/scd0 /mnt/cdroms /mnt/cdroms is the device file for the cdrom I use. Second image - Caldera 2.3 - /root To create the second image on our cd, we need get information about sectors related to the first track. To do that, issue the command cdrecord -v -dev=0,3,0 -msinfo Cdrecord returns the following number 0,135563 This number is the format XX,YY discussed on README.multi. XX would be used for testing the images as well as burning the new track. mkisofs -D -l -r -f -m core -L -C 0,135563 -M /dev/scd0 -o image2.raw caldera/=/root Now we need to check of image2.raw is ok. The following command creates exactly what we need. Plese note that -C option. Only the first number changes in this case. The second one is always zero. In our case the first number is zero due to cdrecord -msinfo. When more tracks are added to the cd this number will change. mkisofs -D -l -r -f -m core -L -C 0,0 -M /dev/scd0 -o image2_test.raw caldera/=/root mount -t iso9660 image2_test.raw /mnt/image -o loop ls -l /mnt/image shows that there are two directories: redhat and caldera, just the way we wanted. Now let us burn image2.raw (not image2_test.raw) cdrecord -v -dev=0,3,0 -multi -eject image2.raw We can mount the CD again to see that the two directories are there. We can carry on doing this until we decide to close the CD. If this is the case, don't use -multi when burning the last session. b) A dir1/dir2/=/dir3/dir4 and dir1/dir2a=/dir5/dir6 example The above example seems a bit silly, one could argue. Why did I create a single directory called root and within two sub-directories: redhat and caldera? Using the procedure described above we would do as follows: mkisofs -D -l -r -f -m core -L -o image1.raw etc/redhat/=/mnt/redhat/etc cdrecord -v -dev=0,3,0 -multi -eject image1.raw To check the burned image we need to mount the cd; something like mount -t iso9660 /dev/scd0 /mnt/cdroms cdrecord -v -dev0,3,0 -msinfo Cdrecord returns the following number 0,14391 The second image can be created using mkisofs -l -r -f -m core -L -C 0,14391 -M /dev/scd0 -o image2.raw etc/caldera/=/etc Creating a test image2 mkisofs -l -r -f -m core -L -C 0,0 -M /dev/scd0 -o image2_test.raw etc/caldera/=/etc mount -t iso9660 image2_test.raw /mnt/image1 -o loop It works!! That is great!!! Now the burning process itself. cdrecord -v -dev=0,3,0 -multi -eject image2.raw and we're done !!!! To add more tracks just do as indicated above. Good luxk!!! Eduardo Mendes - 11/23/99
