README.graft_dirs
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- 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